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171777-68-7

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171777-68-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 171777-68-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,7,7 and 7 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 171777-68:
(8*1)+(7*7)+(6*1)+(5*7)+(4*7)+(3*7)+(2*6)+(1*8)=167
167 % 10 = 7
So 171777-68-7 is a valid CAS Registry Number.

171777-68-7Relevant articles and documents

Preparation of [2',3',5',6'-2H4]pteroylglutamic acid

Dueker,Jones,Smith,Clifford

, p. 981 - 991 (1995)

Folic acid plays a key role in nucleic acid biosynthesis, essential for normal cell proliferation and function. Localized folate deficiencies may be related to changes in cytology associated with cancer development; analogs of folic acid, such as methotrexate, are potent chemotherapeutic agents and are widely used either alone or in combination therapy for many types of cancer. In this report we describe the synthesis of a tetra-deuterated folic acid from perdeuterated toluene. The primary intermediate, N-(4-amino [2,3,5,6-2H4]benzoyl)-L-glutamic acid diethyl ester was coupled to N(2')-acetyl-6-formylpterin to create [2',3',5',6'-2H4]folic acid. A similar scheme can be used for the preparation of F [1',2',3',4',5',6'-13C6]folic acid from [13C6] ring labeled toluene.

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