Functional molecule, functional molecule synthesizing amidite and target substance analysis method

A functional molecule synthesizing amidite expressed by General Formula (I) below and used for the manufacture of a functional molecule, where X represents a base, Y represents a substituent and Q represents one of a hydrogen atom and a hydroxyl group;

• wherein the substituent Y is introduced to the base X through an aromatic carboxylic acid structure in the substituent Y, and the base X is one of adenine and cytosine;
• or the substituent Y is introduced to the base X through an aliphatic carboxylic acid structure in the substituent Y, and the base X is guanine,
• wherein the substituent Y can be removed by at least one method selected from the group consisting of a method involving an ammonia treatment, a method involving an alkali treatment using NaOH, a method involving a treatment using hydrofluoric acid and fluoride, a method involving a treatment using hydrazine, and a method involving irradiation of light, and
• wherein the functional molecule is convertible to be a molecule having a structure similar to that of naturally occurring nucleic acid by removing the substituent Y from the functional molecule;