The CAS Registry Mumber 95519-58-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,5,1 and 9 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 95519-58: (7*9)+(6*5)+(5*5)+(4*1)+(3*9)+(2*5)+(1*8)=167 167 % 10 = 7 So 95519-58-7 is a valid CAS Registry Number.