109521-81-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 109521-81-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,5,2 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 109521-81:
(8*1)+(7*0)+(6*9)+(5*5)+(4*2)+(3*1)+(2*8)+(1*1)=115
115 % 10 = 5
So 109521-81-5 is a valid CAS Registry Number.
InChI:InChI=1/C20H20O7/c1-3-15-9(2)19-16-10(6-11(26-15)8-20(24,25)27-19)7-12-13(21)4-5-14(22)17(12)18(16)23/h4-5,7,11,16,19,24-25H,3,6,8H2,1-2H3/b15-9-/t11-,16?,19+/m1/s1