masoprocol masoprocol masoprocol is an antineoplastic drug used to treat skin growths caused by sun exposure. a form of nordihydroguaiaretic acid that is taken by mouth is being studied in the treatment of prostate cancer. masoprocolclinical datatrade namesactinexahfs/drugs.commicromedex detailed consumer informationroutes ofadministrationtopicalatc codel01xx10 (who) pharmacokinetic databioavailabilityvery lowidentifiers iupac name 4-benzene-1,2-diol cas number27686-84-6 ypubchem cid71398iuphar/bps4265drugbankdb00179 ychemspider64490 yunii7bo8g1byquchebichebi:73468 nchemblchembl313972 ncomptox dashboard (epa)dtxsid5045178 echa infocard100.044.172 chemical and physical dataformulac18h22o4molar mass302.370 g·mol−13d model (jsmol)interactive image smiles oc1ccc(cc1o)c(c)(c)cc2ccc(o)c(o)c2 inchi inchi=1s/c18h22o4/c1-11(7-13-3-5-15(19)17(21)9-13)12(2)8-14-4-6-16(20)18(22)10-14/h3-6,9-12,19-22h,7-8h2,1-2h3/t11-,12+ ykey:hczkyjdfepmadg-txejjxnpsa-n y ny (what is this?) (verify) also called nordihydroguaiaretic acid, ndga, and actinex. mechanism nordihydroguaiaretic acid is an antioxidant, and it may block certain enzymes needed for tumor growth. it is a lipoxygenase inhibitor.