\begin{forest} for tree={ if level=0{align=center}{% allow multi-line text and set alignment align={@{}C{45mm}@{}}, }, grow=east, draw, % font=\sffamily\bfseries, edge path={ \noexpand\path [draw, \forestoption{edge}] (!u.parent anchor) -- +(5mm,0) |- (.child anchor)\forestoption{edge label}; }, parent anchor=east, child anchor=west, l sep=10mm, tier/.wrap pgfmath arg={tier #1}{level()}, edge={ultra thick, rounded corners=2pt}, fill=white, rounded corners, top color=white, bottom color=white, }, forked edges [A [\chemfig{-Si-} ] [B2 ] ]
! Package pgf Error: No shape named n2-1 is known.
Ich gehe mal davon aus, dass das an den Strichen liegt?
Hat da jemand eine Idee?