The CAS Registry Mumber 57914-15-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,9,1 and 4 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 57914-15: (7*5)+(6*7)+(5*9)+(4*1)+(3*4)+(2*1)+(1*5)=145 145 % 10 = 5 So 57914-15-5 is a valid CAS Registry Number.