The CAS Registry Mumber 85689-26-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,6,8 and 9 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 85689-26: (7*8)+(6*5)+(5*6)+(4*8)+(3*9)+(2*2)+(1*6)=185 185 % 10 = 5 So 85689-26-5 is a valid CAS Registry Number.
Synthesis of some 1-aryl-4-(2-hydroxybenzoyl)-pyrazol-5-one and 1-aryl[1]benzopyrano[2,3-c]pyrazol-4(1H)-one derivatives from 3-acyl-4-hydroxycoumarins
Chantegrel,Nadi,Gelin
, p. 214 - 216 (1983)
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