90-21-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 90-21-1 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 9 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 90-21:
(4*9)+(3*0)+(2*2)+(1*1)=41
41 % 10 = 1
So 90-21-1 is a valid CAS Registry Number.
InChI:InChI=1/C10H7ClO7S2/c11-8-3-6(19(13,14)15)1-5-2-7(20(16,17)18)4-9(12)10(5)8/h1-4,12H,(H,13,14,15)(H,16,17,18)