Gaussian16 optimizations of aminoiminobutanedinitrile conformers in water PCM model with adjusted epsilon of 144.8. 

Manual search for the most stable amino-iminobutanedinitrile molecule. I_L_109 is the name of the most stable structure. L-form.

B3LYP: Optimizations at B3LYP-D3/6-31+G(d,p) level of theory 
PBE: Optimizations at PBE-D3/6-31G(d,p) level of theory 
