O=C(c1ccccc1)c1ccc(N2C(=O)/C(=C/c3ccccc3S)N=C2c2ccccc2)c(N2C(=O)/C(=C/c3ccccc3S)N=C2c2ccccc2)c1
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?