| 摘要 |
2117883 9324509 PCTABS00028 A compound represented by general formula ¢I! or a salt thereof, being extremely reduced in the decomposability by gastric juice as compared with other known erythromycin derivatives and having an excellent activity of promoting the movement of digestive tracts, wherein R1 represents hydrogen or acyl; R2 and R3 may be the same or different from each other and each represents hydrogen, hydroxy, acyloxy or amino, or alternatively R2 and R3 are combined together to represent =O or =NOR10, wherein R10 represents hydrogen or lower alkyl; R4 represents hydrogen or lower alkyl; and Y represents -NR5R6 or -N+R7R8R9X-, wherein R5, R6, R7, R8 and R9 may be the same or different from one another and each represents hydrogen, optionally substituted lower alkyl, lower alkenyl, lower alkynyl or cycloalkyl, or a 3- to 7-membered heterocyclic group containing oxygen, nitrogen or sulfur as the heteroatom, and X represents an anion, provided that a pair of R5 and R6 and a pair of R7 and R8 may be each combined with the adjacent nitrogen atom to represent azacycloalkyl.
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