Decomposable polymer

A decomposable polymer represented by the following General Formula (1);

• wherein X1 denotes a group represented by the following General Formula (2);
• X2 denotes a group represented by the following General Formula (3);
• R1 and R2 each independently denote a hydrogen atom, an alkyl group, an aromatic group, or an electron-withdrawing group;
• R3 and R4 each independently denote a hydrogen atom, an alkyl group, or an aromatic group, provide that R3, R4, or both thereof are a hydrogen atom;
• R5 and R6 each independently denote a hydrogen atom, an alkyl group, or an aromatic group, provide that R5, R6, or both thereof are a hydrogen atom;
• R7 and R8 each independently denote a hydrogen atom, a halogen atom, an alkyl group, or an aromatic group, provided that R7 and R8 may bond together to form a ring structure;
• R9 and R10 each independently denote a hydrogen atom, an alkyl group, or an aromatic group;
• n denotes a positive integer;
• and m denotes 0 or 1;
• wherein Y1 denotes an oxygen atom or a sulfur atom;
• wherein R11 and R12 each independently denote a hydrogen atom, an alkyl group, an aromatic group, or an electron-withdrawing group;
• R13 and R14 each independently denote a hydrogen atom, an alkyl group, or an aromatic group;
• X3 denotes a single bond or a group represented by the following General Formula (4);
• k denotes 0 or a positive integer, provided that when X3 is the single bond, k is 0;
• and a carbon atom indicated by a symbol * hinds to a carbon atom of a carbonyl group indicated by a symbol * in the General Formula (1);
• wherein Y2 denotes an oxygen atom or a sulfur atom.