asymHet5N ( molecules )

unfused planar acceptor nitrogen in asymmetric 5-member ring

nonringN2 ( molecules )

RNR (N double-bonded to an R)

asymHet6N ( molecules )

unfused planar acceptor nitrogen in asymmetric 6-member ring

symHet6N ( molecules )

unfused planar acceptor nitrogen in symmetric 6-member ring

symHet5N ( molecules )

unfused planar acceptor nitrogen in symmetric 5-member ring

acycEther ( molecules )

ether oxygen not in a ring system

hetNH (
        molecules,
        ringSize,
        aromaticOnly=0,
        )

unfused trigonal planar nitrogens in 'ringSize'-member rings

het5O ( molecules )

oxygen in 5-member ring