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216854-54-5

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216854-54-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 216854-54-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,6,8,5 and 4 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 216854-54:
(8*2)+(7*1)+(6*6)+(5*8)+(4*5)+(3*4)+(2*5)+(1*4)=145
145 % 10 = 5
So 216854-54-5 is a valid CAS Registry Number.

216854-54-5Relevant articles and documents

New straightforward synthesis and characterization of a unique 1β- methylcarbapenem antibiotic biapenem bearing a σ-symmetric bicyclotriazoliumthio group as the pendant moiety

Kumagai, Toshio,Tamai, Satoshi,Abe, Takao,Matsunaga, Hiroshi,Hayashi, Kazuhiko,Kishi, Ikuo,Shiro, Motoo,Nagao, Yoshimitsu

, p. 8145 - 8149 (2007/10/03)

Biapenem 1, (1R,5S,6S,)-2-[(6,7-dihydro-5H-pyrazolo[1,2- α][1,2,4]triazolium-6-yl)thio]-6-yl)thio]-6-[(R)-1-hydroxyethyl]-1- methylcarbapen-2-em-3-carboxylate, is a new non-natural 1β-methylcarbapenem antibiotic which exhibits a wide range of antibacterial activity, remarkable chemical stability, and extensive stability against human renal dehydropeptidase-I. Mercaptobicyclotriazolium chloride 2 useful for the pendant moiety of 1 was successfully synthesized starting from hydrazine hydrate 3 along an economically available synthetic route. The thiol 2 was efficiently exploited for an expeditious synthesis of biapenem 1. Characterization (crystal structure, nonbonded S- - -O interaction, conformational analysis, and CH- - -O hydrogen bonds) of 1 was investigated by its X-ray crystallographic, 1H NMR, and deuteration experiment analyses.

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