The CAS Registry Mumber 12001-30-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,0,0 and 1 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 12001-30: (7*1)+(6*2)+(5*0)+(4*0)+(3*1)+(2*3)+(1*0)=28 28 % 10 = 8 So 12001-30-8 is a valid CAS Registry Number.