Patent ID: 7385051

Claim:
A compound of the formula I and an oligonucleotide comprising one or more moieties thereof, said compound having the formula: wherein R 1 is —NHR 7 , halo, —SR 7 or —N═CH—N(CH 3 ) 2 ; R 2 and R 3 , the same or different, each is H, hydrocarbyl, —NR 7 R 8 , —SR 7 or —OR 7 ; R 4 is H or —OR 9 ; R 5 , R 6 and R 9 the same or different each is H, alkanoyl, PO 3 2− , P 2 O 6 3− , P 3 O 9 4− ; or R 5 is 2-cyanoethyl-N,N-diisopropyl-phosphoramidite and R 6 is 4,4′-dimethoxytrityl; R 7 and R 8 the same or different each is H, hydrocarbyl or heterocyclyl; and salts thereof.