1239856-87-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1239856-87-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,3,9,8,5 and 6 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1239856-87:
(9*1)+(8*2)+(7*3)+(6*9)+(5*8)+(4*5)+(3*6)+(2*8)+(1*7)=201
201 % 10 = 1
So 1239856-87-1 is a valid CAS Registry Number.
1239856-87-1Relevant articles and documents
PROCESS FOR THE PREPARATION OF (1-OXA- OR l-THIA-)3- CEPHEM DERIVATIVES AND RELATED INTERMEDIATES
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Page/Page column 14-15, (2010/11/28)
There is described a process for the preparation of carboxy-protected 7β-amino-7α-methoxy-(l-oxa- or l-thia-)3-(l-substituted-lH-tetrazol-5-yl)thiomethyl-3- cephem-4-carboxylic acid. Said process comprises (a) reacting a carboxy- protected 7-amino-3-chlor
