Despite the fact that Chimera computes atom types, it does not explicitly compute bond orders.  Internally it does compute bond orders in ring systems in order to do the best job it can judging aromaticity, but those computations aren't preserved once aromaticity is decided on.  So I guess the short answer is no, since we don't have easy access to the bond order.

--Eric

Eric Pettersen

UCSF Computer Graphics Lab