摘要 |
<p>Compounds are provided having the structure <IMAGE> wherein R1 is carboxyl; hydroxymethyl; CO2R3 wherein R3 is lower alkyl, Li+, Na+ or K+; or <IMAGE> R2 is hydrogen, lower alkyl, aryl or trifluoromethyl; and X is hydrogen, lower alkyl, lower alkoxy, halogen (Cl, Br and F), or trifluoromethyl. These compounds are useful as anti-allergics.</p> |