Patent ID: 8383792

Claim:
A nucleic acid comprising at least one of structures represented by the following formulae (16), (16b), (17) or (17b) a tautomer or stereoisomer of the nucleic acid; or a salt of the nucleic acid, the tautomer, or the stereoisomer: where in the formulae (16), (16b), (17) and (17b), B is an atomic group having a natural nucleobase (adenine, guanine, cytosine, thymine, or uracil) skeleton or an artificial nucleobase skeleton, each of Z 11 and Z 12 is an atomic group that exhibits fluorescence and exhibits an exciton effect, and Z 11 and Z 12 may be identical to or different from one another, each of L 1 , L 2 , and L 3 is a linker (a linking atom or an atomic group), a length of a main chain (the number of main chain atoms) is arbitrary, each of L 1 , L 2 , and L 3 may or may not contain C, N, O, S, P, or Si in the main chain, each of L 1 , L 2 , and L 3 may or may not contain a single bond, a double bond, a triple bond, an amide bond, an ester bond, a disulfide bond, an imino group, an ether bond, a thioether bond, or a thioester bond in the main chain, and L 1 , L 2 , and L 3 may be identical to or different from one another, D is CR, N, P, P═O, B, or SiR, and R is a hydrogen atom, an alkyl group, or an arbitrary substituent, b is a single bond, a double bond, or a triple bond, or in the formula (16) and (16b), each of L 1 and L 2 is a linker, L 3 , D, and b may not be present, and L 1 and L 2 may be bonded directly to B, where in the formulae (16) and (17), E is an atomic group having a deoxyribose skeleton, a ribose skeleton, or a structure derived from either one of them, and at least one O atom in a phosphoric acid linkage may be substituted with an S atom, in the formulae (16b) and (17b), E is an atomic group having a peptitude structure or a peptoid structure, and in the formulae (17) and (17b), the respective Bs may be identical to or different from each other, and the respective Es may be identical to or different from each other.