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138253-24-4

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138253-24-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138253-24-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,2,5 and 3 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 138253-24:
(8*1)+(7*3)+(6*8)+(5*2)+(4*5)+(3*3)+(2*2)+(1*4)=124
124 % 10 = 4
So 138253-24-4 is a valid CAS Registry Number.

138253-24-4Relevant articles and documents

Stereoselective Synthesis of 2,3-Dihydroxy-4-dimethylamino-5-methoxypentanoic Acid, A Fragment of Calyculins - Determination of the Absolute Configuration of Calyculins

Hamada, Yasumasa,Tanada, Yoshihisa,Yokokawa, Fumiaki,Shiori, Takayuki

, p. 5983 - 5986 (1991)

2,3-Dihydroxy-4-dimethylamino-5-methoxypentanoic acid (2) with (2R,3R,4R)-configuration has been stereoselectively prepared from (S)-pyroglutaminol (3) and revealed to be the enantiomer of the compound derived from calyculins (1), which provides the conclusicve evidence on the absolutr configuration of calyculins.

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