c1ccccc1
C1CCCCC1
C1CCNC1
c1ccc2sccc2c1
c1ccc(cc1)c2ccccc2
c1ccc(cc1)c2cccs2
C(c1ccccc1)c2ccccc2
C(c1ccccc1)c2cccnc2
C(c1ccccc1)c2cccs2
C(c1ccccc1)c2ccsc2
C(Cc1ccccc1)Oc2ccccc2
C(COc1ccccc1)Cc2ccccc2
C(Oc1ccccc1)c2ccccc2
N(c1ccccc1)c2ccccc2
O(c1ccccc1)c2ccccc2