4,5a,6,13-tetramethyl-6,13-dihydro-5aH-6,13-methano-naphtho[1',8':4,5,6]pentaleno[1,6a-k]fluoranthene-5,17-dione is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 20852-09-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,5 and 2 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 20852-09: (7*2)+(6*0)+(5*8)+(4*5)+(3*2)+(2*0)+(1*9)=89 89 % 10 = 9 So 20852-09-9 is a valid CAS Registry Number.