The CAS Registry Mumber 308069-41-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,8,0,6 and 9 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 308069-41: (8*3)+(7*0)+(6*8)+(5*0)+(4*6)+(3*9)+(2*4)+(1*1)=132 132 % 10 = 2 So 308069-41-2 is a valid CAS Registry Number.