The CAS Registry Mumber 361433-25-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,6,1,4,3 and 3 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 361433-25: (8*3)+(7*6)+(6*1)+(5*4)+(4*3)+(3*3)+(2*2)+(1*5)=122 122 % 10 = 2 So 361433-25-2 is a valid CAS Registry Number.