The CAS Registry Mumber 65741-91-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,7,4 and 1 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 65741-91: (7*6)+(6*5)+(5*7)+(4*4)+(3*1)+(2*9)+(1*1)=145 145 % 10 = 5 So 65741-91-5 is a valid CAS Registry Number.
The synthesis and chemistry of 5-carboxy-8-mercaptoquinoline hydrochloride monohydrate: An intermediate in the synthesis of novel H+,K+-ATPase inhibitors
Zawistoski
, p. 657 - 665 (1991)
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