Patent ID: 7550588

Claim:
A compound having the following structure: or its enantiomer or racemic mixtures thereof, wherein the compound is selected from the group of a compound wherein R1, R2 and R4 and R6 are hydrogen, R3 is 2-naphthyl, R5 is —COEt, and R7 is methyl; a compound wherein R1, R2, R4 and R6 are hydrogen, R3 is 4-i-PrPh, R5 is —COEt, and R7 is methyl; a compound wherein R1, R2, R4 and R6 are hydrogen, R3 is 4-ClPh, R5 is —COEt, and R7 is methyl; a compound wherein R1, R2, R4 and R6 are hydrogen, R3 is 4-(C 6 H 4 )CH═CH 2 , R5 is —COEt, and R7 is methyl; a compound wherein R1, R2, R4 and R6 are hydrogen, R3 is 4-(C 6 H 4 )C(Me)=CH 2 , R5 is —COEt, and R7 is methyl; a compound wherein R1 is hydrogen, R2 is methyl, R4 and R6 are hydrogen, R3 is p-tolyl, R5 is —COEt, and R7 is methyl; a compound wherein R1 is hydrogen, R2 is phenyl, R4 and R6 are hydrogen, R3 is p-tolyl, R5 is —COEt, and R7 is methyl; a compound wherein R1, R2 and R7 are methyl, R3 is p-tolyl, R4 and R6 are hydrogen, and R5 is —COEt; a compound wherein R1 and R7 are methyl, R2 is phenyl, R3 is p-tolyl, R4 is hydrogen, R5 is —COEt, and R6 is hydrogen; a compound wherein R1, R2, R4 and R5 are hydrogen, R3 is 2-naphthyl, R6 is —COEt, and R7 is methyl; and, a compound wherein R1, R2, R4, R6 and R7 are hydrogen, R3 is p-tolyl, and R5 is —COEt.