Aromatic compound, mixture, molecular probe for hyperpolarization, metabolite, diagnostic agent, derivatization agent, naphthalene derivative, catechol derivative, and compound

A mixture containing an aromatic compound composed of a stable isotope, the mixture comprising:

• a first aromatic compound in which two adjacent carbon atoms are 13C, atomic nuclei of other atoms to which the two adjacent carbon atoms are bonded have a spin quantum number of 0, and a hydrogen atom which has a spin coupling constant and is bonded to the 13C nucleus through a carbon atom is substituted with a deuterium atom;
• and
• a second aromatic compound in which one of two adjacent carbon atoms is 13C and the other of the two adjacent carbon atoms is 12C, atomic nuclei of other atoms to which the two adjacent carbon atoms are bonded have a spin quantum number of 0, and a hydrogen atom which has a spin coupling constant and is bonded to the 13C nucleus through a carbon atom is substituted with a deuterium atom.

A naphthalene derivative represented by Formula (1),

• in Formula (1), R1's are each independently any one group selected from the group consisting of a deuterium atom, an alkyl group, an aryl group, and a monovalent group derived from an alkene, an alkyne, an amine, a silyl, a carbonyl compound, an ether, a thiol, an ester, a phosphoric acid ester, or a sulfoxide.

A catechol derivative represented by Formula (2),

• in Formula (2), R2 and R3 are each independently any one group selected from the group consisting of a hydrogen atom, a deuterium atom, an alkyl group, an aryl group, and a monovalent group derived from an alkene, an alkyne, an amine, a silyl, a carbonyl compound, an ether, a thiol, an ester, a phosphoric acid ester, or a sulfoxide, and R4's are each independently any one group selected from the group consisting of a deuterium atom, an alkyl group, an aryl group, and a monovalent group derived from an alkene, an alkyne, an amine, a silyl, a carbonyl compound, an ether, a thiol, an ester, a phosphoric acid ester, or a sulfoxide, provided that at least one of R4's is a deuterium atom.