| abstract |
Carboxylic acid derivatives having potent retinoid-type pharmacological activities are disclosed. The compounds disclosed are represented by the following formula:n n wherein R¹, R², and R³ independently represent a hydrogen atom or an alkyl group with the exception that all of R¹, R², and R³ do not simultaneously represent hydrogen atoms and R¹ together with R² optionally represent a cyclic structure formed by the combination thereof; R⁴ represents a hydrogen atom or an alkyl group; X represents a nitrogen atom or C-OH; and A represents -CO-NH- or -NH-CO-. |