The CAS Registry Mumber 93914-45-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,9,1 and 4 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 93914-45: (7*9)+(6*3)+(5*9)+(4*1)+(3*4)+(2*4)+(1*5)=155 155 % 10 = 5 So 93914-45-5 is a valid CAS Registry Number.