The keto linker of 2-naphthoate retinoid 1 has been found nonessential
for RAR transactivation activity and can be replaced with heteroatoms
such as S, O, N without significant reduction of the activity. On the
other hand, substitutions on the aromatic rings of retinoids 1 and 2
resulted in analogs with reduced potentcy and RAR selectivity. Copyrig
ht (C) 1996 Elsevier Science Ltd