O=C1/C(=C/C=C/c2ccccc2)N=C(c2ccccc2)N1C1Nc2cc3c(cc2S1)NC(N1C(=O)/C(=C/C=C/c2ccccc2)N=C1c1ccccc1)S3
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?