You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (6S)-7-[[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-prop-2-enoxyiminoacetyl]amino]-3-[(4,6-diamino-3-methyl-1,4-dihydropyrimidin-3-ium-2-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate ?
user
C21H25N9O5S3
assistant