C1CCC1
C1CCCC1
c1ccccc1
C1CCCCC1
C1CCCCCC1
C1CCCCCCC1
C1CCCNCC1
c1ccncc1
C1CCNCC1
C1CCN=CC1
c1c[nH]cn1
c1cscn1
C2Cc1ccncc1C2
c2ccc1cnccc1c2
c2ccc1[nH]cnc1c2
c2ccn1ccnc1c2
c2ncc1nc[nH]c1n2
nonring