Actually, we have many possibilities nd it depends with content of this extract for example if it's reach with alkaloids, it could be betacarboline alkaloids, if it is reach with flavonoids then it could e reach with anthocyanin nd....... as i told u many possibilities
If you are asking what compound you can dissolve in ethyl acetate to create a red colour, then nile red is the way to go. Very soluble and highly luminescent too.