68
H. Zhu et al.
HN
O O
OH
HN
N
H
O
NH
O
N
H
HN
O O
R
HN
N
H
O
NH
O
N
H
439 (aspochalamin A)
440 (aspochalamin B)
441 (aspochalamin C) R = OH
442 (aspochalamin D) R = H
446 (spicarin A)
447 (spicarin B)
HN
O O
O
O
O
OAc
OAc
OAc
OAc
HN
O O
O
OAc
O
AcO
OAc
OAc
NH
O O
O
OH
O
OH
O
HO
NH
O O
O
OH
O
O
HO
OH
NH
O O
O
OH
O
O
HO
OH
448 (asperchalasine B)
450 (asperchalasine D (450)
449 (asperchalasine C)
HN
O O
OH
O
S
NH
O
HN
O O
OH
O
S
O
HO
O
443 (cyschalasin A)
444 (cyschalasin B)
HN
O
O
HO
O
OH
O
OH
O
451 (asperchalasine E)
NH
O O
OH
OH
N
N
N
445 (iizukine C)
19
Fig. 19 Structures of mero-aspochalasins and aspochalasin-homodimers