The CAS Registry Mumber 91361-01-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,3,6 and 1 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 91361-01: (7*9)+(6*1)+(5*3)+(4*6)+(3*1)+(2*0)+(1*1)=112 112 % 10 = 2 So 91361-01-2 is a valid CAS Registry Number.