A laboratory for drug quality control checks the quality of the drug substance nitrofural (furacilin). The chemical denomination of this drug is:

Answer options

1. N(-(2-Furantdil)-5-fluorouracil
2. 5-Nitro-2-furaldehyde semicarbazone
3. 1,2-Diphenyl-4-butylpyrazolidine-dione-3,5
4. 7-Nitro-5-phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one
5. 1-(5-Nitrofurfurilidenamino)imidazolidine-2 ,4-dione