/usr/share/xdrawchem2/retro.txt is in xdrawchem 2.0-4.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 | <-R>C=C<-R>;;Horner-Wittig reaction (C=C double bond)
<-R><-R><-R>C-O;;Grignard reaction (tertiary alcohol)
<-R><=O>C-N<-R>;;amide condensation
<-R><=O>C-O<-R>;;ester condensation
<-C(-R)><=O>Cr-Or<-C(-R)(-R)>;;Bayer-Villiger oxidation
<-C(=C[-C])><-C(=C[-C])>Cr-C<-N(-R)><=O>;;Birch reduction
<-C(=C[-C])><-C(=C[-C])>Cr-C<-O(-R)><=O>;;Birch reduction
<-C(-C[-C])(-N[-C][-C])><-N(-C[*C][*C])>Cr=Cr<-C(*C[*C])(*C[*C][-N])><-C(-C[-N])>;;Bischler-Napieralski reaction
<-C><-O>C=C<-C(-O[-C])(=O)><-O>;;Chan rearrangement
<-C><-O>C-C<-C(-R)(=O)>;;Claisen condensation
<-C(-C)(-O[-C])><-O(-C[-C][-C])>Cr-C<-C><=O>;;Darzen condensation (epoxide)
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