The CAS Registry Mumber 41763-04-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,1,7,6 and 3 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 41763-04: (7*4)+(6*1)+(5*7)+(4*6)+(3*3)+(2*0)+(1*4)=106 106 % 10 = 6 So 41763-04-6 is a valid CAS Registry Number.