The CAS Registry Mumber 94348-39-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,3,4 and 8 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 94348-39: (7*9)+(6*4)+(5*3)+(4*4)+(3*8)+(2*3)+(1*9)=157 157 % 10 = 7 So 94348-39-7 is a valid CAS Registry Number.