The CAS Registry Mumber 96335-85-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,3,3 and 5 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 96335-85: (7*9)+(6*6)+(5*3)+(4*3)+(3*5)+(2*8)+(1*5)=162 162 % 10 = 2 So 96335-85-2 is a valid CAS Registry Number.