Patent ID: 8865766

Claim:
A compound with structure of Formula (I): or derivative, isomer, or enantiomer thereof; wherein R 1 is hydrogen or R 1a C(O)—; R 2 is hydrogen or R 2a C(O)—; R 3 is hydrogen or R 3a C(O)—; R 1a and R 2a are independently unsubstituted C 1 -C 10 alkyl, unsubstituted C 3 -C 8 cycloalkyl, or unsubstituted aryl; R 4 and R 5 are independently hydrogen, unsubstituted C 1 -C 10 alkyl, or unsubstituted C 3 -C 8 cycloalkyl; and, R 3a is unsubstituted C 1 -C 3 alkyl; provided, however, that at least one of R 1 , R 2 and R 3 is not hydrogen.