The CAS Registry Mumber 58572-15-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,8,5,7 and 2 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 58572-15: (7*5)+(6*8)+(5*5)+(4*7)+(3*2)+(2*1)+(1*5)=149 149 % 10 = 9 So 58572-15-9 is a valid CAS Registry Number.