the following 5 vitamin a compounds were about one-fourth as effective as ra : the trimethylmethoxyphenyl analog of ethylretinamide , the phenyl analog of retinoic acid , the trimethylmethoxyphenyl analog of ethyl retinoate , beta-retinyl acetate , and retinol .
C0042839
vitamin a
C0040845
retinoic acid