The CAS Registry Mumber 76072-07-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,0,7 and 2 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 76072-07: (7*7)+(6*6)+(5*0)+(4*7)+(3*2)+(2*0)+(1*7)=126 126 % 10 = 6 So 76072-07-6 is a valid CAS Registry Number.