the ability of various retinoids to compete with all-trans-retinoic acid for binding to crabp was assayed : 4-oxoretinoic acid and two synthetic retinoids were effective competitors , but 13-cis-retinoic acid , 3,4-didehydroretinoic acid and the acid derivative of etretinate competed poorly .
C0035339
retinoids
C0022265
13-cis-retinoic acid