Synthesis and plant growth regulation activity of α-d-ManpNAc-(1→2)-[α-l-Rhap-(1→3)-]α-l-Rhap-(1→4)-β-d-GlupNAc-(1→3)-α-l-Rhap, the repeating unit of O-antigen of Rhizobium trifolii 4s.

Highlights: [•] A pentasaccharide analog has been synthesized for the first time. [•] The plant growth regulation activity of this analog was studied. [•] The activity data shows the analog can stimulate the growth of wheat coleoptile. [Copyright &y& Elsevier]