We don't have synonyms for biomolecules yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are biomolecule and biomolecular.
(n) :
(biochemistry) Molecules, such as amino acids, sugars, nucleic acids, proteins, polysaccharides, DNA, and RNA, that occur naturally in living organisms; any such molecule, even if created outside a living thing (as for example in a test tube or bioreactor).
(n) :
(biochemistry) Molecules, such as amino acids, sugars, nucleic acids, proteins, polysaccharides, DNA, and RNA, that occur naturally in living organisms; any such molecule, even if created outside a living thing (as for example in a test tube or bioreactor).