div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Sprayed with anis-aldehyde src=https:reader037fdocumentsinreader037viewer202210280856812d3d550346895d92442dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divpSprayed with anis-aldehydeSprayed with molybdenum blueSprayed with ninhydrinp pDPG DPGPEPE PEp pPI PIp pPGLp pFigure S1pdiv