Patent ID: 7038085

Claim:
An isolated compound represented by A: wherein X represents independently for each occurrence O or S; R represents independently for each occurrence H; R 1 represents independently for each occurrence H; R 2 represents independently for each occurrence H; R 3 represents independently for each occurrence H, alkyl, cycloalkyl, alkenyl, or arylalkyl; R 4 is absent or present between one and four times inclusive; R 4 , if present, represents independently for each occurrence H, alkyl, cycloalkyl, alkenyl, aryl, heteroaryl, arylalkyl, cyano, halogen, hydroxyl, alkoxyl, aryloxy, arylalkyloxy, amino, alkylamino, arylamino, arylakylamino, sulfhydryl, alkylthio, arylthio, arylakylthio, nitro, azido, alkylseleno, formyl, acyl, carboxyl, silyl, silyloxy, (alkyloxy)carbonyl, (aryloxy)carbonyl, (arylalkyloxy)carbonyl, (alkylamino)carbonyl, (arylamino)carbonyl, (arylalkylamino)carbonyl, alkylsulfonyl, arylsulfonyl, or —(CH 2 ) m —R 80 ; R 80 represents independently for each occurrence an aryl, cycloalkyl, cycloalkenyl, heterocyclyl, or polycyclyl moiety; m is independently for each occurrence an integer in the range 0 to 8 inclusive; and the compound is a single enantiomer; or a pharmaceutically acceptable salt or prodrug thereof.