81-73-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81-73-2 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 1 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81-73:
(4*8)+(3*1)+(2*7)+(1*3)=52
52 % 10 = 2
So 81-73-2 is a valid CAS Registry Number.
InChI:InChI=1/C21H12N2O3/c22-14-9-13-18(23-15-8-4-3-7-12(15)19(13)24)17-16(14)20(25)10-5-1-2-6-11(10)21(17)26/h1-9H,22H2,(H,23,24)