The CAS Registry Mumber 88786-19-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,7,8 and 6 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 88786-19: (7*8)+(6*8)+(5*7)+(4*8)+(3*6)+(2*1)+(1*9)=200 200 % 10 = 0 So 88786-19-0 is a valid CAS Registry Number.