More preferred carbocyclic aliphatic rings include cyclohexyl, cycloheptyl, and cyclooctyl. [0068] The term ???carbonyl??? is art-recognized and includes such moieties as can be represented by the general formula: [0069] wherein X is a bond or represents an oxygen or a sulfur, and R11 represents a hydrogen, hydrocarbon substituent, or a pharmaceutically acceptable salt, R11??? represents a hydroge