 Several chemical compounds — some with unique biological activity — have been isolated and identified from Hydnellum species . For example , H. peckii contains atromentin , a pigment with anticoagulant properties similar to heparin . <unk> also possesses antibacterial activity , inhibiting the enzyme enoyl @-@ acyl carrier protein reductase ( essential for the biosynthesis of fatty acids ) in the bacteria Streptococcus pneumoniae . 
