| 摘要 |
A compound, or a solvate or salt thereof, of formula (I) <CHEM> in which: 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, preferably methyl or ethyl, or phenyl, or R3 together with R1 form a -(CH2)3- or -(CH2)4- group; p is 1, 2, 3 or 4, and R is a group of formula (II) <CHEM> in which the group -(CHR4)n-X- is in the meta- or paraposition with respect to YR5 or R6, R4 is hydrogen or C1-6 alkyl, preferably hydrogen; n is 0, 1 or 2, preferably 1; X is a direct bond, or O, S or NRa in which Ra is hydrogen or C1-6 alkyl, and is preferably a direct bond; Y is >C=O, >CHOH, -S=O or - SO2; each of R5 and R6 is C1-6 alkyl, or R5 and R6 are linked together and R5 represents -(Z)m- where m is 0 or 1 and Z is O, S or NR7 where R7 is hydrogen or C1-6 alkyl, and R6 represents -(CH2)q- where q is an integer of from 1 to 4, preferably 2 or 3, and in which one or more of the -(CH2)- groups is optionally substituted by a C1-6 alkyl group, is useful for the treatment of pain. |
