2-Butenoic acid, 3-hydroxy-2-methyl-, ethyl ester, (Z)- (9CI) is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 132723-28-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,7,2 and 3 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 132723-28: (8*1)+(7*3)+(6*2)+(5*7)+(4*2)+(3*3)+(2*2)+(1*8)=105 105 % 10 = 5 So 132723-28-5 is a valid CAS Registry Number.