You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-morpholin-4-ylsulfonyl-1H-pyrrol-2-yl)-[4-(2-thiophen-2-ylethyl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O4S2
assistant