The CAS Registry Mumber 29974-41-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,9,7 and 4 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 29974-41: (7*2)+(6*9)+(5*9)+(4*7)+(3*4)+(2*4)+(1*1)=162 162 % 10 = 2 So 29974-41-2 is a valid CAS Registry Number.