You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[9-[2-carboxy-4-[4-[[2-[3-[[ethyl-[8-[1-[4-hydroxy-5-[[hydroxy-[[hydroxy(phosphonooxy)phosphoryl]methyl]phosphoryl]oxymethyl]oxolan-2-yl]-4,6-dioxopyridin-3-yl]-4-oxooct-7-ynoyl]amino]methyl]indol-1-yl]acetyl]amino]butanoyl]phenyl]-6-(dimethylamino)xanthen-3-ylidene]-dimethylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C60H68N6O20P3+
assistant