How to create complex chord

[Larry]

Hello,

I need to create a chord of which part is a tuplet and don't know how.

Attached is an image of what I want to do:
here's my attempt (which doesn't work):

\version "2.18.2"
\language "english"

\paper {
  #(set-paper-size "letter")
}

global = {
  \key e \major
  \time 4/4
}

right = \relative c' {
  \global
  \tempo "Adagio sostenuto"
  \tuplet 3/2 { e,8 gs cs }
}

left = \relative c,  {
  \global
      { <cs gs cs' >1 }
}

\score {
  \new PianoStaff \with {
    instrumentName = "Piano"
  } <<
    \new Staff = "right" \with {
      midiInstrument = "acoustic grand"
    } \right
    \new Staff = "left" \with {
      midiInstrument = "acoustic grand"
    } { \clef bass \left }
  >>
  \layout { }
  \midi {
    \tempo 4=70
  }
}

Larry

example1.gif
Description: GIF image