155657-23-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 155657-23-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,6,5 and 7 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 155657-23:
(8*1)+(7*5)+(6*5)+(5*6)+(4*5)+(3*7)+(2*2)+(1*3)=151
151 % 10 = 1
So 155657-23-1 is a valid CAS Registry Number.
155657-23-1Relevant academic research and scientific papers
Thiazolylpropenedicarboxylic acid half esters and process for making
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, (2008/06/13)
A useful intermediate for synthesizing penicillins or cephalosporins {i.e., 1-(2-protected amino-4-thiazolyl)propene-1,3-dicarboxylic acid half ester (VI)} is prepared by a process comprising (1) treating haloacetylmalonic acid ester (I) with thiourea to
