You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,14R,16R,20S,23S,24S)-23-acetyl-5-[(Z)-2-[[2-[(1R,14R,16R,20S,23S,24S)-23-acetyl-6-[(Z)-2-aminoethenyl]-24-ethyl-18,21-dioxo-2,17-dioxa-5,7,19,22-tetrazatetracyclo[20.2.1.03,8.014,16]pentacosa-3,5,7-trien-20-yl]-2-methylpropyl]amino]ethenyl]-20-[1-[(1R,17R,19R,23S,26S,27S)-26-acetyl-23-tert-butyl-27-methyl-21,24-dioxo-2,20-dioxa-6,9,22,25-tetrazapentacyclo[23.2.1.03,11.05,9.017,19]octacosa-3,5,7,10-tetraen-8-yl]-2-methylpropan-2-yl]-24-ethyl-2,17-dioxa-4,6,8,19,22-pentazatetracyclo[20.2.1.03,8.014,16]pentacosa-3,5-diene-7,18,21-trione is the IUPAC name of a molecule. Please give its molecular formula.
user
C86H121N15O16
assistant