The CAS Registry Mumber 94565-38-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,5,6 and 5 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 94565-38: (7*9)+(6*4)+(5*5)+(4*6)+(3*5)+(2*3)+(1*8)=165 165 % 10 = 5 So 94565-38-5 is a valid CAS Registry Number.