161744-20-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 161744-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,7,4 and 4 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 161744-20:
(8*1)+(7*6)+(6*1)+(5*7)+(4*4)+(3*4)+(2*2)+(1*0)=123
123 % 10 = 3
So 161744-20-3 is a valid CAS Registry Number.
161744-20-3Relevant articles and documents
Isochromanyl-penicillins
Unterhalt,Krebs,Lage,Nocon
, p. 799 - 804 (1994)
(R/S)-Isochroman-1-carboxylic acid (1) is resolved to its enantiomers and as well as these reacted with 6-aminopenicillanic acid to the title compounds 2. The activity of the new penicillin-derivatives against gram positive and gram negative bacteria is c