Patent ID: 8835656

Claim:
A linker for nucleic acid solid phase synthesis, comprising a compound represented by the following formula wherein X 1 and X 2 are each independently a hydroxy-protecting group that is dissociated by acid, L 1 and L 2 are each independently a linkage moiety that is cleaved by alkali, R 1 -R 6 are each independently a hydrogen atom; a C 1-6 alkyl group optionally substituted by a C 1-6 alkoxy group; a C 1-6 alkoxy group; a C 1-7 acyl group; a mono or di-C 1-6 alkylamino group; or a halogen atom, or R 2 and R 5 are joined to form, together with the carbon atom bonded thereto, a 3- to 8-membered carbocycle or heterocycle each optionally substituted by a substituent selected from (1) an oxo group, (2) a C 1-6 alkyl group optionally substituted by a C 1-6 alkoxy group, and (3) a phenyl group optionally substituted by a C 1-6 alkoxy-carbonyl group.