In yet other embodiments, RX, RY, R3a, R7a and R7b are each hydrogen, Q is a substituted or unsubstituted heteroaryl moiety and the compound has the structure: In yet other embodiments, Q is an aryl or heteroaryl moiety having one of the structures: wherein RA???RG are as defined generally above and in classes and subclasses herein , and one of RA???RG is wherein R3a is hydrogen, a nitrogen protec