The CAS Registry Mumber 118527-45-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,5,2 and 7 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 118527-45: (8*1)+(7*1)+(6*8)+(5*5)+(4*2)+(3*7)+(2*4)+(1*5)=130 130 % 10 = 0 So 118527-45-0 is a valid CAS Registry Number.