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Simon MC, Strassburger K, Nowotny B, Kolb H, Nowotny P, Burkart V, et al
[73] As noted above, the completely synthetic laboratory synthesis of B 12 was achieved by Robert Burns Woodward and Albert Eschenmoser in 1972, though this process has no commercial potential, requiring more than 70 steps and having a yield well below 0.01%
2kj,nq and 3pr and Extended Data Figs
Nu bn ang tm kim gii php cho ln da trng sng v u mu, glutathione chc chn l mt la chn ng cn nhc
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