The CAS Registry Mumber 57914-14-4 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 4 respectively. Calculate Digit Verification of CAS Registry Number 57914-14: (7*5)+(6*7)+(5*9)+(4*1)+(3*4)+(2*1)+(1*4)=144 144 % 10 = 4 So 57914-14-4 is a valid CAS Registry Number.