The CAS Registry Mumber 72206-96-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,2,0 and 6 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 72206-96: (7*7)+(6*2)+(5*2)+(4*0)+(3*6)+(2*9)+(1*6)=113 113 % 10 = 3 So 72206-96-3 is a valid CAS Registry Number.