| abstract |
A compound of the ** formula **, wherein R1 is an H, halo, or a C1-C6 straight chain alkyl; R2 is selected from an H, C1-C10 alkyl, C4-C9 cycloalkyl, C4-C9 heterocycloalkyl, C4-C9 heterocycloalkylalkyl, cycloalkylalkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, - (CH2) nC (O) R6, - (CH2 ) nOC (O) R6, aminoacyl, HONC (O) -CH = C (R1) -aryl-alkyl- and - (CH2) nR7; R3 and R4 are the same or different and independently an H, C1-C6 alkyl, acyl or acylamino, or R3 and R4 together with the carbon to which they are attached represent a C = S, or C = NR8, or R2 together with the nitrogen to which it is attached and R3 together with the carbon to which it is attached can form a C4-C9 heterocycloalkyl, a heteroaryl, a polyheteroaryl, a non-aromatic polyheterocycle, or a mixed aryl and non-aryl polyheterocycle ring; or a pharmaceutically acceptable salt thereof. |