(2S,3S,4R)-N''-cyano-N-(6-nitro-3,4-dihydro-3-hydroxy-2-methyl-2-dimethoxymethyl-2H-benzopyran-4-yl)-N'-benzylguanidine

(2S,3S,4R)-4-amino-3,4-dihydro-2-dimethoxymethyl-3-hydroxy-2-methyl-6-nitro-2H-1-benzopyran

phenyl N'-cyano-N-((2S,3R,4S)-2-(dimethoxymethyl)-3-hydroxy-2-methyl-6-nitrochroman-4-yl)carbamimidate

(2S,3R,4S)-N'-benzyl-N''-cyano-N-(3,4-dihydro-2-dimethoxymethyl-3-hydroxy-2-methyl-6-nitro-2H-benzopyran-4-yl)guanidine

(2S)-6-nitro-2-methyl-2-dimethoxymethyl-3,4-epoxy-3,4-dihydro-2H-1-benzopyran