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49553-16-4

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49553-16-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 49553-16-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,9,5,5 and 3 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 49553-16:
(7*4)+(6*9)+(5*5)+(4*5)+(3*3)+(2*1)+(1*6)=144
144 % 10 = 4
So 49553-16-4 is a valid CAS Registry Number.

49553-16-4Relevant articles and documents

Improved method for synthesizing L-thyroxine sodium

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Paragraph 0041; 0043; 0045; 0046; 0066; 0067; 0069; 0071, (2019/06/11)

The invention relates to an improved method for synthesizing L-thyroxine sodium. The improved method includes the steps that 3,5-diiodomethane-L-tyrosine is used as a raw material, and then subjectedto a copper complex reaction, a coupling reaction, an acid hydrolysis reaction, an iodine generation reaction and a salt forming reaction to obtained the L-thyroxine sodium. According to the improvedmethod for synthesizing the L-thyroxine sodium, the yield of the L-thyroxine sodium can be improved, the product cost is lowered, and industrialization is convenient.

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