You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R,5S,6S)-3-[[4-(4-aminophenyl)-1,3-thiazol-2-yl]sulfanyl]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19N3O4S2
assistant