The CAS Registry Mumber 39727-79-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,7,2 and 7 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 39727-79: (7*3)+(6*9)+(5*7)+(4*2)+(3*7)+(2*7)+(1*9)=162 162 % 10 = 2 So 39727-79-2 is a valid CAS Registry Number.