Patent ID: 6890933

Claim:
A compound having the chemical structure: wherein R, R′, R″ and R′″ as valency and stability permit are each independently selected from the group consisting of substituted or unsubstituted, branched or unbranched alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heterocycle, heteroalkyl, hydrogen, —(C═O)R B , and —(SO 2 )R B , wherein each occurrence of R B as valency and stability permit is independently selected from the group consisting of substituted or unsubstituted, branched or unbranched alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalkyl, heterocycle, alkoxy, aryloxy, alkylthio, arylthio, heteroaryloxy, heteroarylthio, hydrogen, and —(C═O)R C , wherein R C as valency and stability permit is selected from the group consisting of substituted or unsubstituted, branched or unbranched alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, heteroaryl, heteroalkyl, heterocycle, alkoxy, aryloxy, alkylthio, arylthio, heteroaryloxy, heteroarylthio, and hydrogen; with the proviso that the following groups do not occur simultaneously as defined: a) R′″ is —CO 2 CH 3 , and (i) R and R″ are each hydrogen and R′ 0 is methyl, ethyl, cyclohexyl, —CH(OEt) 2 , phenyl, o-nitrophenyl, o-hydroxyphenyl, o-aminophenyl or 3-pyridinyl; (ii) R is methyl, R′ is methyl, ethyl, cyclohexyl or phenyl, and R″ is hydrogen; (iii) R is hydrogen, R″ is —C(═O)CH 3 and R′ is propyl or butyl; (iv) R′ is ethyl and R″ is —CH 2 Ph; b) R, R′ and R′″ are each hydrogen, and R″ is methyl; and c) R and R′″ are each hydrogen, and R′ and R″, taken together, are —CH 2 ) 4 —.