What's the Block Pathway to Desmostral?

The block pathway would be lenastro goes through a lot of precursors and becomes something called desmostral. Desmostral looks exactly like callestral, except in carbon 24, ter's a double bond. So if i just saturate that double bond in desde mostral, i change it into callustral. And of course, there's a specific ensign that does that. If you're using that and you don't convert desmasto into collestral, you're goig t have a lot of desma stroll in your system.