| 摘要 |
Described herein are compounds of the formula <IMAGE> wherein R1 is alkyl of from 1 to about 5 carbon atoms, alkenyl of from 2 to about 5 carbon atoms, alkynyl of from 3 to about 5 carbon atoms, cycloalkyl of from 3 to about 7 carbon atoms, alkylcarboxymethyl wherein the alkyl portion is from 1 to about 5 carbon atoms, arylcarboxymethyl wherein the aryl portion is from 6 to about 10 carbon atoms, aryl of from 6 to about 10 carbon atoms, or aralkyl wherein the alkyl portion is from 1 to about 5 carbon atoms and the aryl portion is from about 6 to about 10 carbon atoms; R2 and R3 are independently hydrogen or alkyl of from 1 to about 3 carbon atoms; X is alkyl of from 1 to about 4 carbon atoms, alkenyl of from 2 to about 4 carbon atoms, alkynyl of 3 or 4 carbon atoms, alkoxy of from 1 to about 4 carbon atoms, hydroxyalkyl of from 1 to about 4 carbon atoms, alkylamino of from 1 to about 4 carbon atoms, halogen, amino, nitro, hydroxy, acetamido, or cyano; m is an integer from 0 to about 3, A is a direct bond, alkylene of from 1 to about 5 carbon atoms, or alkenylene of from 2 to about 5 carbon atoms, Y is alkyl of from 1 to about 4 carbon atoms, alkenyl of from 2 to about 4 carbon atoms, alkynyl of 3 or 4 carbon atoms, alkoxy of from 1 to about 4 carbon atoms, hydroxyalkyl of from 1 to about 4 carbon atoms, alkylamino of from 1 to about 4 carbon atoms, halogen, amino, nitro, hydroxy, acetamido, or cyano; n is an integer from 0 to about 3; and the pharmaceutically acceptable salts thereof.
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