6-chloro-7-deazapurine

[IngvarLa]

Opsin gives ClC1=C2CC=NC2=NC=N1 for 6-chloro-7-deazapurine

I would expect ClC1=C2C=CNC2=NC=N1

i.e., that an H migrates to the other N in the 5-membered ring, rather than stay on transmuted C