C1CC1
c1ccccc1
C1CCNC1
c1ccncc1
C1CCNCC1
c1cn[nH]c1
c1cscn1
c1ccc2[nH]ncc2c1
c1ccc2n[nH]cc2c1
C1CCN(C1)Cc2ccccc2
C1CC(CCN1)NCc2ccccc2
C(NCc1ccccc1)c2ccccc2
C(Oc1ccccc1)c2ccccc2
O(c1ccccc1)c2ccccc2