The CAS Registry Mumber 94903-41-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,9,0 and 3 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 94903-41: (7*9)+(6*4)+(5*9)+(4*0)+(3*3)+(2*4)+(1*1)=150 150 % 10 = 0 So 94903-41-0 is a valid CAS Registry Number.