The CAS Registry Mumber 72214-46-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,2,1 and 4 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 72214-46: (7*7)+(6*2)+(5*2)+(4*1)+(3*4)+(2*4)+(1*6)=101 101 % 10 = 1 So 72214-46-1 is a valid CAS Registry Number.