zeranol zeranol zeranol (inn, usan, ban) (brand names frideron, ralabol, ralgro, ralone, zerano; developmental code names mk-188, p-1496), or zearanol, also known as α-zearalanol or simply zearalanol, is a synthetic nonsteroidal estrogen of the resorcylic acid lactone group related to mycoestrogens found in fungi in the fusarium genus and is used mainly as an anabolic agent in veterinary medicine. zeranolclinical datatrade namesfrideron, ralabol, ralgro, ralone, zeranoother nameszearanol; α-zearalanol; zearalanol; mk-188; p-1496routes ofadministrationby mouthdrug classnonsteroidal estrogenidentifiers iupac name (3s,7r)-7,14,16-trihydroxy-3-methyl-3,4,5,6,7,8,9,10,11,12-decahydro-1h-2-benzoxacyclotetradecin-1-one cas number26538-44-3 npubchem cid2999413chemspider2271133 nunii76lo2l2v39chemblchembl371463 ycomptox dashboard (epa)dtxsid4022315 echa infocard100.043.411 chemical and physical dataformulac18h26o5molar mass322.401 g·mol−13d model (jsmol)interactive image smiles c1ccc(o)cccccc2cc(o)cc(o)c2c(=o)o1 inchi inchi=1s/c18h26o5/c1-12-6-5-9-14(19)8-4-2-3-7-13-10-15(20)11-16(21)17(13)18(22)23-12/h10-12,14,19-21h,2-9h2,1h3/t12-,14+/m0/s1 nkey:dwttzbardoxeam-gxtwgepzsa-n n ny (what is this?) (verify) zeranol is approved for use as a growth promoter in livestock, including beef cattle, under the brand name ralgro (by merck animal health) in the united states. in canada, it is approved for use in beef cattle only. its application is not approved for use in the european union. however, it is marketed under the brand name ralone in spain. although zeranol may increase cancer cell proliferation in already existing breast cancer, dietary exposure from the use of zeranol-containing implants in cattle is insignificant. zeranol may be found as a contaminant in fungus-infected crops. it is 3 to 4 times more potent as an estrogen than the related compound zearalenone. it is a metabolite of zearalenone.