63165-90-2 Acetic acid, (bis(3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene)cyclopropylidene)cyano-, ethyl ester Ethyl (bis(3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadiene-1-ylidene)cyclopropylidene)cyanoacetate