(4cR,9bS)-4b,4c,9b,9c-Tetrahydro-dibenzo[d,d']cyclobuta[1,2-b;3,4-b']dithiophene 5,5,10,10-tetraoxide is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 25558-19-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,5,5 and 8 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 25558-19: (7*2)+(6*5)+(5*5)+(4*5)+(3*8)+(2*1)+(1*9)=124 124 % 10 = 4 So 25558-19-4 is a valid CAS Registry Number.