You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-[[(3R,3aR,6S,6aR)-6-[(2S)-2-carboxy-2-(phenylmethoxycarbonylamino)ethoxy]-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-3-yl]oxy]propyl-(diaminomethylidene)azanium is given. What is its corresponding molecular formula?
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C21H31N4O8+
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