👉 1942 tert-butyl 4-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzoate; 676552-20-8 is a compound commonly used in organic chemistry. 1942. tert-butyl 4-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzoate; 676552-20-8