| 摘要 |
<p>Retinoid compounds of formula (I) and their salts are new. X = 4- or 5-OR1, or oxo; R1 = H, alkyl or acyl; R2 = H or alkyl; where the 3,4 bond is single or double and the 8,9 bond is double or triple. The 3,4 bond is double only when X is in 5-position.</p> |
