Small fix for build_structures
Small fix for build_structures

fosfataza/protwis,cmunk/protwis,fosfataza/protwis,protwis/protwis,cmunk/protwis,cmunk/protwis,protwis/protwis,fosfataza/protwis,fosfataza/protwis,protwis/protwis,cmunk/protwis