| 释义 |
py·ran
\ˈpīˌran\ noun
(-s)
Etymology: International Scientific Vocabulary pyr- + -an
: either of two parent cyclic compounds C5H6O that contain five carbon atoms and one oxygen atom in the ring:
a. : the alpha isomer — called also 2H-pyran
b. : the gamma isomer — called also 4H-pyran; see pyrone; compare chroman, xanthene |