https://ctan.math.utah.edu/ctan/tex-archive/macros/generic/chemfig/?C=N;O=D
Index of /ctan/tex-archive/macros/generic/chemfig
index ofctantexarchivemacros
https://ctan.org/ctan-ann/id/mailman.4992.1614589910.2532.ctan-ann@ctan.org?lang=en
CTAN: CTAN-ann - CTAN Update: chemfig
ctanannupdate
https://mirrors.mit.edu/CTAN/macros/generic/chemfig/
chemfig
https://ctan.org/ctan-ann/id/mailman.4992.1614589910.2532.ctan-ann@ctan.org?lang=de
CTAN: CTAN-ann - CTAN Update: chemfig
ctanannupdate