| prov:value
| - Additional specific values include compounds having the formula (Ib)-(Id) or a pharmaceutically acceptable salt thereof: A group of specific compounds of formula (Ia) are those wherein each R7 is H, X is ethylaminocarbonyl, R1 and R2 are each hydrogen, and Z is a 4-piperidyl-1-carboxylic acid or ester group, wherein Ra is methyl, ethyl, propyl, isopropyl, isobutyl, or t-butyl, 4.
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