The CAS Registry Mumber 1427286-50-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,2,7,2,8 and 6 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1427286-50: (9*1)+(8*4)+(7*2)+(6*7)+(5*2)+(4*8)+(3*6)+(2*5)+(1*0)=167 167 % 10 = 7 So 1427286-50-7 is a valid CAS Registry Number.