You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[2-[(E)-[(2E)-2-[(5-ethyl-1,3,4-thiadiazol-2-yl)imino]-3-methyl-4-oxo-1,3-thiazolidin-5-ylidene]methyl]phenoxy]butanoic acid .
user
C19H20N4O4S2
assistant