The CAS Registry Mumber 29752-14-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,7,5 and 2 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 29752-14: (7*2)+(6*9)+(5*7)+(4*5)+(3*2)+(2*1)+(1*4)=135 135 % 10 = 5 So 29752-14-5 is a valid CAS Registry Number.