Composition, resin composition, composition for film formation, pattern formation method, and compound

A resin composition comprising:

• a polymer comprising at least a constitutional unit represented by the following formula (4) and having 5 or more constitutional units;
• a compound (B) represented by the following formula (2) in a content of 1% by mass or less based on the polymer;
• and
• a compound (A) represented by the following formula (1):
• wherein
• each X is independently I, F, Cl, Br, or an organic group having 1 to 30 carbon atoms and having 1 or more and 5 or less substituents selected from the group consisting of I, F, Cl, and Br;
• each L1 is independently a single bond, an ether group, an ester group, a thioether group, an amino group, a thioester group, an acetal group, a phosphine group, a phosphone group, a urethane group, a urea group, an amide group, an imide group, or a phosphate group, and the ether group, the ester group, the thioether group, the amino group, the thioester group, the acetal group, the phosphine group, the phosphone group, the urethane group, the urea group, the amide group, the imide group, or the phosphate group of L1 optionally has a substituent;
• each Y is independently a hydroxyl group, an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, a carbonate ester group, a nitro group, an amino group, a carboxyl group, a thiol group, an ether group, a thioether group, a phosphine group, a phosphone group, a urethane group, a urea group, an amide group, an imide group, or a phosphate group, and the alkoxy group, the ester group, the carbonate ester group, the amino group, the ether group, the thioether group, the phosphine group, the phosphone group, the urethane group, the urea group, the amide group, the imide group, and the phosphate group of Y optionally have a substituent;
• each of Ra, Rb, and Rc is independently H, I, F, Cl, Br, or an organic group having 1 to 8 carbon atoms and optionally having a substituent;
• A is an organic group having 6 to 30 carbon atoms;
• each Z is independently an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, or a carbonate ester group, and the alkoxy group, the ester group, the acetal group, the carboxyalkoxy group, or the carbonate ester group of Z optionally has a substituent;
• and
• p is an integer of 1 or more, m is an integer of 1 or more, n is an integer of 0 or more, and r is an integer of 0 or more;
• wherein
• X, L1, Y, Ra, Rb, Re, A, Z, p, m, n, and r are the same as those described in the formula (1), and k represents an integer of 0 or more and 2 or less;
• and
• wherein X, L1, Y, Ra, Rb, Rc, A, Z, p, m, n, and r are as defined in the formula (1);
• and
• * is a site for binding with an adjacent constitutional unit.

A compound represented by the following formula (2):

• wherein
• each X is independently I, F, Cl, Br, or an organic group having 1 to 30 carbon atoms and having 1 or more and 5 or less substituents selected from the group consisting of I, F, Cl, and Br;
• each L1 is independently a single bond, an ether group, an ester group, a thioether group, an amino group, a thioester group, an acetal group, a phosphine group, a phosphone group, a urethane group, a urea group, an amide group, an imide group, or a phosphate group, and the ether group, the ester group, the thioether group, the amino group, the thioester group, the acetal group, the phosphine group, the phosphone group, the urethane group, the urea group, the amide group, the imide group, or the phosphate group of L1 optionally has a substituent;
• each Y is independently a hydroxyl group, an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, a carbonate ester group, a nitro group, an amino group, a carboxyl group, a thiol group, an ether group, a thioether group, a phosphine group, a phosphone group, a urethane group, a urea group, an amide group, an imide group, or a phosphate group, and the alkoxy group, the ester group, the carbonate ester group, the amino group, the ether group, the thioether group, the phosphine group, the phosphone group, the urethane group, the urea group, the amide group, the imide group, and the phosphate group of Y optionally have a substituent;
• each of Ra, Rb, and Rc is independently H, I, F, Cl, Br, or an organic group having 1 to 8 carbon atoms and optionally having a substituent;
• A is an organic group having 6 to 30 carbon atoms;
• each Z is independently an alkoxy group, an ester group, an acetal group, a carboxyalkoxy group, or a carbonate ester group, and the alkoxy group, the ester group, the acetal group, the carboxyalkoxy group, or the carbonate ester group of Z optionally has a substituent;
• p is an integer of 1 or more, m is an integer of 1 or more, n is an integer of 0 or more, and r is an integer of 0 or more;
• and
• k represents an integer of 0 or more and 2 or less.