Provided is a compound represented by the following formula (1)whereinR1 is a hydrogen atom, an optionally substituted alkyl group and the like, R2 is a hydrogen atom or an optionally substituted alkyl group,or R1 and R2 optionally form, together with the adjacent nitrogen atom, an optionally substituted nitrogen-containing heterocyclic group,R4 is a hydrogen atom or an optionally substituted alkyl group,R3 is an optionally substituted alkyl group, andR5 and R6 are a hydrogen atom or a methyl group,excluding a compound wherein both R2 and R4 are hydrogen atoms and a compound wherein both R1 and R4 are hydrogen atoms, or a tautomer thereof or a salt thereof useful as a bactericidal/disinfectant agent.
