N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
250
5 1 H NMR
250
5 1 H NMR
N
N
N
N
NH 2
O
OH
HO
OH
NH
N
N
N
O
O
OH
HO
NH 2
NH
N
N
N
O
O
OH
HO
OH
NH 2
N
N
N
N
NH 2
O
OH
HO
(in DMSO)
(in DMSO)
(in DMSO)
(in DMSO)
7.41
7.31
8.38
8.34
5.91
5.72
6.34
6.14
3.99
3.90
3.88
3.83
5.48
5.10
6.52
6.50
10.75
10.7
7.97
7.95
5.25
4.99
4.64
4.43
2.73
2.26
2.53
2.22
4.17
4.11
4.41
4.36
5.51
5.45
5.31
5.31
5.24
5.20
8.17
8.13
3.70
3.58
3.63
3.55
3.62
3.53
3.55