An aromatic nitrogen which isn't connected to a pi bond cannot accept a hydrogen bond.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
This test (which was passing) actually only has a single H bond acceptor. However we need to give it the a kekule structure - this test is for HBondAcceptor and not kekulisation so we provided the correct SMILES.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
Ensure aromaticity is perceived.

Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>