2,3,4,6,7,8-hexahydro-2,2,8,8-tetramethylbenzo<1,2-b;5,4-b'>dipyran is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 39930-97-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,9,3 and 0 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 39930-97: (7*3)+(6*9)+(5*9)+(4*3)+(3*0)+(2*9)+(1*7)=157 157 % 10 = 7 So 39930-97-7 is a valid CAS Registry Number.