/usr/include/sc/chemistry/molecule/ is in libsc-dev 2.3.1-16.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sc/chemistry/molecule/LIBS.h
/usr/include/sc/chemistry/molecule/atominfo.h
/usr/include/sc/chemistry/molecule/coor.h
/usr/include/sc/chemistry/molecule/energy.h
/usr/include/sc/chemistry/molecule/fdhess.h
/usr/include/sc/chemistry/molecule/formula.h
/usr/include/sc/chemistry/molecule/hess.h
/usr/include/sc/chemistry/molecule/linkage.h
/usr/include/sc/chemistry/molecule/localdef.h
/usr/include/sc/chemistry/molecule/molecule.h
/usr/include/sc/chemistry/molecule/molfreq.h
/usr/include/sc/chemistry/molecule/molrender.h
/usr/include/sc/chemistry/molecule/molshape.h
/usr/include/sc/chemistry/molecule/simple.h
/usr/include/sc/chemistry/molecule/taylor.h