The CAS Registry Mumber 91344-99-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,3,4 and 4 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 91344-99: (7*9)+(6*1)+(5*3)+(4*4)+(3*4)+(2*9)+(1*9)=139 139 % 10 = 9 So 91344-99-9 is a valid CAS Registry Number.
Convenient syntheses of 1,3-dihydro-1-oxo-4-isobenzofurancarboxylic acid, 1,3-dihydro-3-oxo-4-isobenzofurancarboxylic acid, and the homologous acetic acids
Skeean,Goel
, p. 628 - 630 (2007/10/02)
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