The　actinomycete　strain　R1706-8　is　isolated　from　a　soil　sample　collected　from　the　nest　of　the　horned-face　bee　(Osmia　cornifrons)　and　identified　as　Streptomyces　sp.　based　upon　the　results　of　16SrRNA　sequence　analysis.　Two　concanamycin　derivatives　obtained　from　the　solid　fermentation　have　been　determined　by　analysis　of　the　infrared,　high-resolution　electrospray　ionization　mass　spectrometry,　1D　and　2D　NMR　spectra　as　well　as　by　comparison　with　literature　data.　Of　the　two　derivatives,　one　is　a　new　compound,　named　concanamycin　H,　and　the　other　is　the　known　compound,　concanamycin　G.　These　compounds　are　assayed　for　antibacterial　activity,　with　concanamycins　H　and　G　displaying　inhibitory　activity　against　Bacillus　subtilis　(minimum　inhibitory　concentration　=　0.625　mu　g　mL(-1)).