Patent ID: 8389703

Claim:
A compound having the structure wherein R 1 and R 2 are independently selected from the group consisting of —H, —CO—X, and R 3 is independently selected from the group consisting of —CH 2 —CH 2 —NO 2 , —CH 2 —CH 2 —CN, and —CH 2 —CH 2 -phenyl-NO 2 , R 4 is independently selected from the group consisting of —X, —CO—X, CH 2 —CH 2 ═CH 2 , —SiX 3 , —CH 2 —O—CH 2 -phenyl-NO 2 , —CH 2 —O—CH 2 —CH 2 —SO 2 -aryl, —CH 2 —O—CH x —CH 2 —CN, —CH 2 —O—CH 2 —CH 2 —CN, levulinyl, —CH 2 —SS—X, and R 5 is —P—(NQ 2 )O—CH 2 —CH 2 —CN, wherein Q is an alkyl group, R 6 is independently selected from the group consisting of trityl, methoxytrityl, dimethoxytrityl, and trimethoxytrityl, R 7 is independently selected from the group consisting of —NO 2 , —CN, —COOR, —CONHR, —CH═CH—CN, —CH═CH—COOR, —CH═CH—CONHR, —CC—CN, —CC—COOR, and —CC—CONHR, wherein R is independently selected from the group consisting of an alkyl group, an aryl group, and an alkyl group further substituted by a protected amino group, a protected carboxyl group, or a protected imidazolyl group, and X is a group independently selected from the group consisting of —H, -alkyl, -alkaryl, aryl, and aralkyl; with the proviso that, in the definition of substituent —SiX 3 , the variable X cannot be H.