| 摘要 |
<p>Novel compounds of the formula <IMAGE> wherein R is hydrogen, a straight or branched alkyl group having from 1 to 8 carbon atoms or benzyl; wherein each of R1 and R2 is hydrogen, an aralkyl group, a straight or branched hydrocarbon group having from 1 to 20 carbon atoms and may be saturated or unsaturated, an alkyl group of from 1 to 6 carbon atoms wherein the terminal carbon is substituted, the group -(CH2)p)-Q wherein p is zero to three and Q is a 5- or 6-membered monocyclic or fused bicyclic heterocycle, phenyl or NR1R2 taken together form a monocyclic heterocyclic ring, and R3 is phenyl, substituted phenyl, naphthyl, substituted naphthyl, -(CH2)p-Q wherein p and Q are as defined above, an aralkyl group or a straight or branched hydrocarbon group having from 1 to 20 carbon atoms and being straight or branched.</p> |
