A compound or its pharmaceutically acceptable salt, optionally including both individual enantiomeric forms, a racemate, diastereomers and mixtures thereof, composition and method are disclosed that can provide analgesia and reduce inflammation. A contemplated compound has a structure that corresponds to Formula A, wherein the R group substituents, d, e, f, k, n, m, D, E, F, K, G, P, Q, W, and Z are defined within.