| 摘要 |
Compounds of formula (I) <IMAGE> (I) and acid addition salts thereof, wherein R1 is hydrogen, hydroxy, alkoxy, aryloxy, aralkoxy, heteroaryloxy or heteroaralkoxy; and one of R2, R3 and R4 is hydrogen and the others are the same or different and each is hydrogen, alkyl, aryl, aralkyl, heteroaryl or heteroaralkyl; or R2 is hydrogen and <IMAGE> is mono- or bi-cyclic amino, inhibit enterotoxin-induced secretion into the small intestine and are, therefore, useful in treating enterotoxin induced diarrhoea in humans and scours in animals.
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