For FT-IR spectra of S, the transmissivity of the peaks at
3850 cm1 and 3740 cm1 achieved the maximum for 40 min,
the transmissivity of the peaks at 3430 cm1 achieved the maximum
for 100 min, the transmissivity of the peaks at 1630 cm1
and 1530 cm1 achieved the maximum for 40 min.