You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-[[(2S)-1-(ethylamino)-1-oxopropan-2-yl]amino]-2-oxoethyl]-[(R)-phenyl(thiophen-2-yl)methyl]azanium into its molecular formula.
user
C18H24N3O2S+
assistant