You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-(3a,7a-dihydro-1,3-benzothiazol-4-ylmethyl)-N-(2-amino-2-oxoethyl)-2-benzyl-6-[(4-hydroxyphenyl)methyl]-4,7-dioxo-3,6,9,9a-tetrahydropyrazino[2,1-c][1,2,4]triazine-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H33N7O5S
assistant