7α-methyl-19-norandrostenedione 7α-methyl-19-norandrostenedione 7α-methyl-19-norandrostenedione (ment dione), or 7α-methyl-19-norandrost-4-ene-3,17-dione, also known as trestione, as well as 7α-methylestr-4-ene-3,17-dione, is a synthetic anabolic-androgenic steroid (aas) and a derivative of 19-nortestosterone (nandrolone). it may act as a prohormone of trestolone (7α-methyl-19-nortestosterone; ment). ment dione has been sold on the internet under the name mentabolan as a "dietary supplement". 7α-methyl-19-norandrostenedioneclinical dataother names7α-methyl-19-norandrost-4-ene-3,17-dione; 7α-methylestr-4-ene-3,17-dione; ment dione; trestione; mentabolanroutes ofadministrationoralidentifiers iupac name (7r,8r,9s,10r,13s,14s)-7,13-dimethyl-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopentaphenanthrene-3,17-dione cas number17000-78-1pubchem cid53916207chemspider31046848unii25w4ola785comptox dashboard (epa)dtxsid00707643 chemical and physical dataformulac19h26o2molar mass286.415 g·mol−13d model (jsmol)interactive image smiles c1cc2=cc(=o)cc2314ccc(=o)4(cc3)c inchi inchi=1s/c19h26o2/c1-11-9-12-10-13(20)3-4-14(12)15-7-8-19(2)16(18(11)15)5-6-17(19)21/h10-11,14-16,18h,3-9h2,1-2h3/t11-,14+,15-,16+,18-,19+/m1/s1key:ihfrekjaifezmq-artwwjdjsa-n