However , the open form ( black ) is unstable , and not observed .
The amide groups of the bislactam form are crosslinked in the cyclol form ; these two tautomers have similar stability , giving an equilibrium constant of ~ 1 .
The open form ( black ) is unstable , and not observed .
The amide groups of the bislactam form are crosslinked in the cyclol form ; these two tautomers have similar stability , giving an equilibrium constant of ~ 1 .