Patent ID: 6943256

Claim:
A compound of the formula wherein R 1 , R 2 , and R 7 each represents hydrogen, halogen, or a substituted or unsubstituted radical independently selected from the group consisting of alkyl, cycloalkyl, aryl, aralkyl, heterocyclo, acyl, and SiR a R b R c ; alternatively, R 1 and R 2 , when taken together, form a ═CR a R b group; or, when taken together with the nitrogen atom to which they are attached, R 1 and R 2 form a heterocyclic ring structure, which may be unsubstituted or substituted; and R a , R b , and R c each represents hydrogen, halogen, or a substituted or unsubstituted radical independently selected from the group consisting of alkyl, cycloalkyl, aryl, aralkyl, heterocyclo, and acyl.