pseudoalteromonas phenolica pseudoalteromonas phenolica pseudoalteromonas phenolica is a marine bacterium species in the genus pseudoalteromonas. pseudoalteromonas phenolica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: pseudoalteromonadaceae genus: pseudoalteromonas species: p. phenolica binomial name pseudoalteromonas phenolica(isnansetyo and kamei 2003) subspecies see text. strain o-bc30 produces mc21-a (3,3′,5,5′-tetrabromo-2,2′-biphenyldiol) while strain o-bc30t produces mc21-b (2,2′,3-tribromo-biphenyl-4-4′-dicarboxylic acid). those two substances show antibacterial activity against methicillin-resistant staphylococcus aureus.