The SMILES Cn1nnc2c(C(N)=O)ncn2c1=O is clinically toxic.
The {#molecule |!}{SMILES__description} {SMILES#} is {clinical_toxicity#not &NULL}{clinical_toxicity__names__adjective}.
3-methyl-4-oxoimidazo[5,1-d][1,2,3,5]tetrazine-8-carboxamide