| 摘要 |
Compounds of formula I <IMAGE> I in which R1 and R2, which may be the same or different, are hydrogen, a C1 to C3 alkyl group or R1 and R2 together with the nitrogen to which they are attached form an optionally substituted heterocyclic ring; R3 and R4, which may be the same or different are hydrogen, a C1 to C3 alkyl or an optionally substituted C3 to C6 cycloalkyl group, or R3 and R4 together with the nitrogen to which they are attached form an optionally substituted heterocyclic ring; m is 0, 1 or 2; p is 0, 1 or 2; E is an alkylene group connected to or interrupted by an oxygen or a sulphur atom; J is hydrogen or a substituent group; and their pharmaceutically acceptable salts have utility as histamine H2-receptor antagonists.
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