203131-05-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 203131-05-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,1,3 and 1 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 203131-05:
(8*2)+(7*0)+(6*3)+(5*1)+(4*3)+(3*1)+(2*0)+(1*5)=59
59 % 10 = 9
So 203131-05-9 is a valid CAS Registry Number.
203131-05-9Relevant academic research and scientific papers
Synthesis of yellow couplers
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, (2008/06/13)
The invention provides a method of synthesis of a image-dye forming coupler of formula (I) STR1 wherein X is a substituent linked to the coupler by an atom of oxygen, sulfur or nitrogen R1 is an alkyl or aryl group, R2 is a hydrogen
