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1. A part of this work was reported in our preliminary communication. C.-B. Cui, H. Kakeya and H. Osada, J. Antibiot., 1996, 49 (8), in press.
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7. C.-B. Cui, M. Ubukata, H. Kakeya, R. Onose, G. Okada, I. Takahashi, K. Isono and H. Osada, J. Antibiot., 1996, 49, 216-219.
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8
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8. C.-B. Cui, H. Kakeya, G. Okada, R. Onose and H. Osada, J. Antibiot., 1996, 49, 527-533.
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11
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85030272750
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note
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13C NMR signal patterns comparing with those of 1. For instance, two amide carbonyl carbons in the diketopiperazine part in 2 appeared in the markedly high field region (δ162.60, C-11 and δ155.09, C-17) than the corresponding carbons in 1 (Table 2), tryprostatins and related diketopiperazine alkaloids (cf. reference 9).
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12
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0002052842
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c) H. Seto, N. Otake, M. Koyama, H. Ogino, Y. Kodama, N. Nishizawa, T. Tsuruoka and S. Inoue, Tetrahedron Lett., 1983, 24, 495-498.
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18
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85030274418
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note
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CH coupling constant of the C-8 methine group.
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19
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0001562009
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15. a) P. S. Steyn, Tetrahedron, 1973, 29, 107-120.
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d) R. M. Williams, E. K. H. Coffman and T. Glinka, J. Am. Chem. Soc., 1989, 111, 3064-3065.
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23
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0022272007
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Founded by L. Zechmiester, Edited by W. Herz, H. Grisebach and G. W. Kirby
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16. P. S. Steyn and R. Vleggaar, Progress in the Chemistry of Organic Natural Products (Founded by L. Zechmiester, Edited by W. Herz, H. Grisebach and G. W. Kirby). 1985, 48, 1-80.
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Steyn, P.S.1
Vleggaar, R.2
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24
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85030277613
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note
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9 positions between 1 and 2 might be involved except for the effect of methoxy group in 1.
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