You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4R,5R,6S)-6-[(1R)-1-hydroxyethyl]-3-methyl-7-oxo-4-(2-pyridin-1-ium-1-ylethyl)-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid ?
user
C17H21N2O4+
assistant