You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[2-[4-(adamantane-1-carbonyl)piperazin-1-ium-1-yl]ethyl]adamantane-1-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C28H44N3O2+
assistant