1. Arch Pharm Ber Dtsch Pharm Ges. 1966 Apr;299(4):312-4. [On the Michael type addition of cyclic hydrazides to activated vinyl groups]. [Article in German]. Zinner G. PMID: 5222267 [PubMed - indexed for MEDLINE]. MeSH Terms. Chemical Phenomena; Chemistry; Hydrazines; Pyrazines*; Pyrazoles*; Triazoles*. Substances. Hydrazines; Pyrazines; Pyrazoles; Triazoles.