The CAS Registry Mumber 37272-06-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,2,7 and 2 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 37272-06: (7*3)+(6*7)+(5*2)+(4*7)+(3*2)+(2*0)+(1*6)=113 113 % 10 = 3 So 37272-06-3 is a valid CAS Registry Number.