You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(2-aminoethyl)-7-N'-[2-(2-aminoethyl)-6-phenyl-5H-pyrazolo[1,5-b][1,2,4]triazol-7-yl]-6-ethylsulfanylpyrazolo[1,5-b][1,2,4]triazole-7,7-diamine by IUPAC nomenclature, provide its molecular formula.
user
C20H26N12S
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