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197853-42-2

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197853-42-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 197853-42-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,8,5 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 197853-42:
(8*1)+(7*9)+(6*7)+(5*8)+(4*5)+(3*3)+(2*4)+(1*2)=192
192 % 10 = 2
So 197853-42-2 is a valid CAS Registry Number.

197853-42-2Upstream product

197853-42-2Relevant articles and documents

Total synthesis of tricolorin A

Lu, Shou-Fu,O'Yang, QinQin,Guo, Zhong-Wu,Yu, Biao,Hui, Yong-Zheng

, p. 8400 - 8405 (2007/10/03)

Tricolorin A (1), a structurally amazing resin glycoside with promising bioactivities from Ipomoea tricolor cav. (convolvulaceae), was synthesized in a total of 45 steps, with the longest linear sequence of 20 steps and overall yield of 0.65% from D-mannitol. The AB disscharide 19-membered lactone 2 was constructured by a regioselective macrolactonization using Corey-Nicolaou protocol. The macrolactone tetrasaccharide 33 was realized either by 'one- pot two-step' glycosylation procedure or by a stepwise assembly employing the 'armed-disarmed' glycosylation strategy.

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