plz explain structure of adenylic acid????and lecithin???/

Adenylic acid is nucleic acid usually adenosine monophosphate that consists of adenine, ribose or deoxyribose, and phosphate group. It is the constituent of DNA or RNA. 

Chemical structure of adenylic acid:

Lecithin is a group of yellow-brownish fatty substances occurring in animal and plant tissues composed of  glycerol, one or two molecules of fatty acid, and a phosphoric acid compound.

Chemical structure of lecithin: