A salt containing a group represented by the formula (aa):
wherein Xa and Xb independently each represent an oxygen atom or a sulfur atom, a ring W represents a C3-C18 heterocycle which has a carbonate ester structure and which can have a substituent, and * represents a binding position is provided.
含有式 (aa) 所代表基团的盐:
其中,Xa 和 Xb 各自独立地代表氧原子或
硫原子,环 W 代表具有
碳酸酯结构且可具有取代基的 C3-C18 杂环,* 代表结合位置。