| 摘要 |
The present invention discloses new cytotoxic tris(oxazole)-containing macrolides having the formula:wherein X represents a lower alkyl; R1 and R2 represent hydrogen or lower alkyl; R3a represents hydrogen, and R3b representsor R3a and R3b together represent oxygen; R4 represents hydrogen, lower alkoxy or lower alkyl; R5 represents hydrogen, carbamoyl, or lower alkanoyl; R6a represents hydrogen, and R6b represents hydroxy, or R6a and R6b together represent oxygen; R7 represents hydrogen, lower alkyl, or hydroxymethyl; R8 represents lower alkoxy or lower alkyl; Y1 represents hydrogen or methyl, and y2 represents hydrogen, or Y1 and Y2 together represent a double bond. Also disclose are methods for treating mammals using the macrolides and pharmaceutical preparations including the macrolides.
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