| 摘要 |
<IMAGE> wherein R1 and R2 are straight chain or branched alkyl groups from one to eight carbon atoms, and are independent alkyl groups not interconnected and k is an integer from zero to five, and the total number of carbon atoms in R1 and R2 plus k are equal to or less than twelve, and wherein p is an integer from one to three; NR is selected from the group consisting of pyrrolidino, piperidino, morpholino and dialkylamino containing a total of two to eight carbon atoms either straight chain or branched; or pharmaceutically acceptable salts thereof.
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