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 h English (en){{chembox
| Verifiedfields = changed
| verifiedrevid = 477226494
| ImageFile = 7-Dehydrocholesterol.svg
| ImageSize = 220
| ImageFile1 = 7-Dehydrocholesterol molecule ball.png
| ImageSize1 = 250
| ImageAlt1 = Ball-and-stick model of 7-dehydrocholesterol
| IUPACName = Cholesta-5,7-dien-3β-ol
| SystematicName = (1''R'',3a''R'',7''S'',9a''R'',9b''S'',11a''R'')-9a,11a-Dimethyl-1-[(2''R'')-6-methylheptan-2-yl]-2,3,3a,6,7,8,9,9a,9b,10,11,11a-dodecahydro-1''H''-cyclopenta[''a'']phenanthren-7-ol
| OtherNames = 
| Section1 = {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 388534
| InChI = 1/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h9-10,18-19,21,23-25,28H,6-8,11-17H2,1-5H3/t19-,21+,23-,24+,25+,26+,27-/m1/s1
| InChIKey = UCTLRSWJYQTBFZ-DDPQNLDTBZ
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h9-10,18-19,21,23-25,28H,6-8,11-17H2,1-5H3/t19-,21+,23-,24+,25+,26+,27-/m1/s1-dehydrocholesterol 
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = UCTLRSWJYQTBFZ-DDPQNLDTSA-N
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 434-16-2
| PubChem = 172
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = BK1IU07GKF
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 17759
| SMILES = O[C@@H]4C/C3=C/C=C1\[C@H](CC[C@]2([C@H]1CC[C@@H]2[C@H](C)CCCC(C)C)C)[C@@]3(C)CC4
| MeSHName = 7-dehydrocholesterol
  }}
| Section2 = {{Chembox Properties
| Formula = C<sub>27</sub>H<sub>44</sub>O
| MolarMass = 384.638
| Appearance = 
| Density = 
| MeltingPt = 
| BoilingPt = 
  }}
| Section3 = {{Chembox Hazards
| MainHazards = 
| FlashPt = 
| AutoignitionPt = 
  }}
}}
[[Image:Skinlayers.png|thumb|250px|right|The epidermal strata of the skin.]] 
'''7-Dehydrocholesterol''' ('''7-DHC''') is a [[zoosterol]] that functions in the [[blood plasma|serum]] as a [[cholesterol]] precursor, and is [[photochemically]] converted to [[Cholecalciferol|vitamin D<sub>3</sub>]] in the [[skin]], therefore functioning as [[provitamin]]-D<sub>3</sub>. The presence of this compound in human skin enables humans to manufacture vitamin D<sub>3</sub> ([[cholecalciferol]]).  Upon exposure to [[ultraviolet]] UV-B rays in the sun light, 7-DHC is converted into vitamin D<sub>3</sub> via [[Previtamin D3|previtamin D<sub>3</sub>]] as an intermediate [[isomer]]. It is also found in the [[milk]] of several mammalian species. [[Lanolin]], a waxy substance that is naturally secreted by wool-bearing mammals, contains 7-DHC which is converted into vitamin D by sunlight and then ingested during grooming as a nutrient. In insects 7-dehydrocholesterol is a precursor for the hormone [[ecdysone]], required for reaching adulthood. It was discovered by Nobel-laureate organic chemist [[Adolf Windaus]].
 h Japanese (ja){{chembox
| Verifiedfields = changed
| verifiedrevid = 477226494
| ImageFile = 7-Dehydrocholesterol.svg
| ImageSize = 220
| ImageFile1 = 7-Dehydrocholesterol molecule ball.png
| ImageSize1 = 250
| ImageAlt1 = 7-デヒドロコレステロールのボール＆スティックモデル
| IUPACName = Cholesta-5,7-dien-3β-ol
| SystematicName = (1''R'',3a''R'',7''S'',9a''R'',9b''S'',11a''R'')-9a,11a-Dimethyl-1-[(2''R'')-6-methylheptan-2-yl]-2,3,3a,6,7,8,9,9a,9b,10,11,11a-dodecahydro-1''H''-cyclopenta[''a'']phenanthren-7-ol
| OtherNames = 
| Section1 = {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 388534
| InChI = 1/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h9-10,18-19,21,23-25,28H,6-8,11-17H2,1-5H3/t19-,21+,23-,24+,25+,26+,27-/m1/s1
| InChIKey = UCTLRSWJYQTBFZ-DDPQNLDTBZ
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h9-10,18-19,21,23-25,28H,6-8,11-17H2,1-5H3/t19-,21+,23-,24+,25+,26+,27-/m1/s1-dehydrocholesterol 
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = UCTLRSWJYQTBFZ-DDPQNLDTSA-N
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 434-16-2
| PubChem = 172
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = BK1IU07GKF
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 17759
| SMILES = O[C@@H]4C/C3=C/C=C1\[C@H](CC[C@]2([C@H]1CC[C@@H]2[C@H](C)CCCC(C)C)C)[C@@]3(C)CC4
| MeSHName = 7-dehydrocholesterol
  }}
| Section2 = {{Chembox Properties
| Formula = C<sub>27</sub>H<sub>44</sub>O
| MolarMass = 384.638
| Appearance = 
| Density = 
| MeltingPt = 
| BoilingPt = 
  }}
| Section3 = {{Chembox Hazards
| MainHazards = 
| FlashPt = 
| AutoignitionPt = 
  }}
}}
[[Image:Skinlayers.png|thumb|250px|right|皮膚の表皮層]] 
'''7-デヒドロコレステロール'''（'''7-DHC'''）は[[zoosterol/ja|動物ステロール]]の一種で、[[blood plasma/ja|血清]]では[[cholesterol/ja|コレステロール]]前駆体として機能し、[[skin/ja|皮膚]]では[[photochemically/ja|光化学的]]に[[Cholecalciferol/ja||ビタミンD<sub>3</sub>]]に変換されるため、[[provitamin/ja|プロビタミン]]-D<sub>3</sub>として機能する。ヒトの皮膚にこの化合物が存在することで、ヒトはビタミンD<sub>3</sub>（[[cholecalciferol/ja|コレカルシフェロール]]）を製造することができる。 [[ultraviolet/ja|紫外線]]を浴びると、ビタミンDは生成される。太陽光に含まれる[[UV-B]]を浴びると、7-DHCは中間[[異性体]]として[[Previtamin D3/ja|プレビタミンD<sub>3</sub>]]を経由してビタミンD<sub>3</sub>に変換される。また、いくつかの哺乳類の[[milk/ja|乳]]にも含まれている。羊毛を持つ哺乳類が自然に分泌する[[lanolin/ja|ラノリン]]という蝋状の物質には7-DHCが含まれており、日光によってビタミンDに変換され、毛づくろいの際に栄養素として摂取される。昆虫では、7-デヒドロコレステロールは成虫になるために必要なホルモン[[ecdysone/ja|エクダイソン]]の前駆体である。ノーベル賞受賞の有機化学者[[:en:Adolf Windaus|アドルフ・ウィンダウス]]によって発見された。
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