Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Structures of shikonin (1) and derivatives thereof.
| Compound | R | Compound | R |
|---|---|---|---|
| 1 | H | 2 |
|
| 3 |
|
4 |
|
| 5 |
|
6 |
|
| 7 |
|
8 |
|
| 9 |
|
10 |
|
| 11 |
|
12 |
|
| 13 |
|
14 |
|
| 15 |
|
16 |
|
| 17 |
|
18 |
|
| 19 |
|
20 |
|
| 21 |
|
22 |
|
| 23 |
|
24 |
|
| 25 |
|
26 |
|
| 27 |
|
28 |
|
| 29 |
|
30 |
|
| 31 |
|
32 |
|
| 33 |
|
34 |
|
