The CAS Registry Mumber 741619-01-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,4,1,6,1 and 9 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 741619-01: (8*7)+(7*4)+(6*1)+(5*6)+(4*1)+(3*9)+(2*0)+(1*1)=152 152 % 10 = 2 So 741619-01-2 is a valid CAS Registry Number.