Patent ID: 11897911
Assignee: SANOFI
Field: Organic fine chemistry (Chemistry)
Classification: CPC A  C | IPC C

Claim 13:
14. The compound of formula (I) according to claim 1, wherein:
one of P1 or P2 is a O-4,4′-dimethoxytrityl group and the other of P1 and P2 is H, a reactive phosphorus group or a protecting group, or
one of P1 and P2 is a 2-cyanoethyl-N,N-diisopropylphosphoramidite group and the other of P1 and P2 is a protecting group, or
one of P1 and P2 is a 2-cyanoethyl-N,N-diisopropylphosphoramidite group and the other of P1 and P2 is 0-4,4′-dimethoxytrityl group,, and Y, B, X1, X2, Ra, Rb, Rc and Rd are as defined in claim 1.