The CAS Registry Mumber 57392-01-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,3,9 and 2 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 57392-01: (7*5)+(6*7)+(5*3)+(4*9)+(3*2)+(2*0)+(1*1)=135 135 % 10 = 5 So 57392-01-5 is a valid CAS Registry Number.