Patent ID: 8716238

Claim:
A compound selected from the group consisting of compounds represented by the formula: wherein R 1 is S-Alk-R wherein Alk is an alkylene or alkylenyl linkage, R is —N═C(NR 3 R 4 )(NR 5 R 6 ) or —NR 7 [(NR 3 R 4 )C═NR 5 ], or —N═C(R 8 )(NR 9 R 10 ), wherein R 3 is H, R 4 is H, R 5 is H, R 6 is H, R 7 is H, R 8 is H, R 9 is H or methyl, R 10 is H or methyl, and R 2 is selected from the group consisting of hydroxyl, alkyl of from 1 to 7 carbon atoms, and hydroxyl-substituted alkyl of from 1 to 7 carbon atoms.