Patent ID: 8822732

Claim:
A compound of the following formula: wherein each of X and Y, independently, is H, alkyl, or halo; and each of R 1 , R 2 , R 3 , R 4 , R 5 , R 1 ′, R 2 ′, R 3 ′, R 4 ′, and R 5 ′, independently, is H, alkyl, halo, OH, R c —O—, R d S(O) 2 —O—, (R d ) 2 P(O)—O—, or (R d O) 2 P(O)—O—, R c being unsubstituted alkyl or alkyl substituted with halo, OH, alkoxy, amino, or cycloalkyl, and R d being H, OH, C 2 -C 10 alkyl, or alkoxy; in which at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 1 ′, R 2 ′, R 3 ′, R 4 ′, and R 5 ′ is R d S (O) 2 —O—, (R d ) 2 P(O)—O—, or (R d O) 2 P(O)—O—.