prov:value
| - R4 is hydrogen and R5 is methyl, ##STR66## R7 is hydrogen, cyclohexyl, lower alkoxy of 1 to 4 carbons, ##STR67## wherein m is zero, one, or two and R13 is hydrogen, methyl, methoxy, methylthio, Cl, Br, F, or hydroxy, especially preferred wherein R7 is hydrogen.
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