  We present the results of the asteroseismic analysis of the
hydrogen-deficient white dwarf PG 0112+104 from the $Kepler$-2 field. Our
seismic procedure using the forward method based on physically sound, static
models, includes the new core parameterization leading us to reproduce the
periods of this star near the precision of the observations. This new fit
outperforms current state-of-the-art standards by order of magnitudes. We
precisely establish the internal structure and unravel the inner C/O
stratification of its core. This opens up interesting perspectives on better
constraining key processes in stellar physics such as nuclear burning,
convection, and mixing, that shape this stratification over time.
