c1ccccc1
c1cncnc1
c1ccc2ncccc2c1
c1ccc2ncncc2c1
c1ccc(cc1)c2ccnn2c3ccccc3
C=C(c1ccccc1)c2ccccc2
C(Nc1cccnc1)c2ccccc2
O=S(=O)(c1ccccc1)c2ccccc2
S(c1ccccc1)c2ccccc2
S(c1ccccc1)c2ccncc2