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system
Please write the molecular formula of the molecule 21-N-[(3E)-hexa-1,3,5-trien-3-yl]-7-N,14-N,18-N,21-N,10,10-hexamethyl-7-N,14-N,18-N-triphenylpentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1,3(11),4(9),5,7,12,14,16,18,20-decaene-7,14,18,21-tetramine .
user
C51H48N4
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