:Piericidin A
{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 432339591
| Name =
| ImageFile = Piericidin A.svg
| ImageSize = 250px
| PIN = 2-[(2E,5E,7E,9R,10R,11E)-10-Hydroxy-3,7,9,11-tetramethyltrideca-2,5,7,11-tetraen-1-yl]-5,6-dimethoxy-3-methylpyridin-4(1H)-one
| OtherNames = Piericidin A1, AR-054
| SystematicName =
| Section1 = {{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo=2738-64-9
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 8VT513UJ9R
| PubChem=6437838
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 138511
| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 4942360
| SMILES = C/C=C(\C)/[C@@H]([C@H](C)/C=C(\C)/C=C/C/C(=C/Cc1c(c(=O)c(c([nH]1)OC)OC)C)/C)O
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/C25H37NO4/c1-9-18(4)22(27)19(5)15-17(3)12-10-11-16(2)13-14-21-20(6)23(28)24(29-7)25(26-21)30-8/h9-10,12-13,15,19,22,27H,11,14H2,1-8H3,(H,26,28)/b12-10+,16-13+,17-15+,18-9+/t19-,22+/m1/s1
| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
| StdInChIKey = BBLGCDSLCDDALX-LKGBESRRSA-N
| MeSHName=Piericidin+A
}}
| Section2 = {{Chembox Properties
| C=25 | H=37 | N=1 | O=4
| Appearance=
| Density=
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| Section3 = {{Chembox Hazards
| MainHazards=
| FlashPt=
| AutoignitionPt =
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Piericidin A is an antibiotic agent.{{Cite web|url=https://meshb.nlm.nih.gov/record/ui?name=Piericidin%20A|title=MeSH Record of Piericidin A|website=U.S. National Library of Medicine, NIH|access-date=2018-05-22}} It was discovered from Streptomyces mobaraensis. Being an inhibitor of NADH dehydrogenase, it inhibits electron transfer; its structure resembles that of the ubiquinone, therefore it competes with QB for binding sites in NADH dehydrogenase as well as photosystem II.