第一个alert 是在ins里手动输入下面其中一个吗（根据实际情况选择）
Options are 'rm', 'ad', 'rmad', 'syn', 'unk' or '.'
rm : absolute configuration established by the structure determination
of a compound containing a chiral reference molecule of known
absolute configuration.
ad : absolute configuration established by anomalous dispersion effects
in diffraction measurements on the crystal.
rmad : absolute configuration established by the structure determination
of a compound containing a chiral reference molecule of known
absolute configuration and confirmed by anomalous dispersion
effects in diffraction measurements on the crystal.
syn : absolute configuration has not been established by anomalous
dispersion effects in diffraction measurements on the crystal.
The enantiomer has been assigned by reference to an unchanging
chiral centre in the synthetic procedure.
unk : absolute configuration is unknown, there being no firm chemical
evidence for its assignment to hand and it having not been
established by anomalous dispersion effects in diffraction
measurements on the crystal. An arbitrary choice of enantiomer
has been made.
. : inapplicable.
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