C1CC1
c1ccccc1
C1CCNC1
c1c[nH]nn1
c1cnoc1
c1cnsc1
C1Cc2ccccc2C1
C1Cc2ccccc2CN1
c1ccc2ccccc2c1
C1CCc2ccccc2C1
c1ccc2ncccc2c1
c1ccc2[nH]ccc2c1
c1cc(on1)c2nn[nH]n2
c1ccc(cc1)c2ccccc2
c1ccc(cc1)c2ccsc2
C(c1ccccc1)c2ccccc2
O=c1cc[nH]c(=O)[nH]1
O=c1nc[nH]o1
O=C(Nc1ccccc1)c2ccccc2