00:02
Name two compounds.
00:06
One is a fucusoratin, and another one is ectocropine.
00:17
Let's start from the left one.
00:20
We need to number the principal chain, the eight carbons there, and three double bonds.
00:29
So it's octotriene.
00:32
We numbered to assign smallest numbers to the double bonds, which places double bonds.
00:39
Bonds at carbon 1, 3 and 5.
00:46
Double bond which starts at carbon 1 has no configuration because there are two hydrogens attached to the same carbon.
00:55
The double bond which starts from carbon 3 has a configuration and the double bond which starts at carbon 5 has z configuration.
01:08
For ectarapine, there are 7 carbons in the ring.
01:21
So the ring is the principal chain...