Patent ID: 7321027

Claim:
A compound represented by the formula: wherein: R 1 and R 2 each are independently selected from lower alkyl group having 1 to about 4 carbon atoms; or —NR 1 R 2 taken in combination is a heterocyclic ring according to the formula: where A is CH 2 , NR D , O or S; R D is chosen from the group consisting of hydrogen, lower alkyl group having from 1 to about 4 carbon atoms, aralkyl groups having from 7 to about 18 carbon atoms, aryl groups having 6 to about 18 carbon atoms, alkyl ester groups having about 2 to about 8 carbon atoms, and aryl ester groups having about 7 to about 18 carbon atoms; X is a —(CH 2 ) q group; and q is an integer selected from 1 to 6.