| 摘要 |
<p>A compound, or a solvate or salt thereof of formula (I), in which RCO is an acyl group in which the group R contains a substituted or unsubstituted carbocyclic aromatic or heterocyclic aromatic ring; R1 and R2 are independently hydrogen, C1-6 alkyl, C2-6 alkenyl, C3-6 cycloalkyl or C4-12 cycloalkylalkyl groups, or together form a C2-8 branched or linear polymethylene or C2-6 alkenylene group, optionally substituted with a hetero-atom, provided that R1 and R2 are not simultaneously hydrogen; R3 is hydrogen, C1-6 alkyl, or phenyl, or R3 together with R1 form a -(CH2)3- or -(CH2)4- group; and R4 is hydrogen, C1-6 alkyl, C1-6 alkoxy, hydroxy or halogen.</p> |
