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【单选题】
巴比妥类药物构效关系表述正确的是( )。A.
R1的总碳数1～2最好
B.
R2以乙基取代起效快
C.
若R（R1）为H原子，仍有活性
D.
R（R1、R2）2～5碳链取代，或有一为苯环取代
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举一反三
【简答题】The following compounds are all unsaturated hydrocarbons except______ A) Acetylene B) Alkenes C) Alkynes D) Methane
【简答题】试述原则的根据,结合当前两岸政治、经济实际说明,只有坚持原则才能实现和平统一。
【简答题】All minerals are compounds of various elements.
【简答题】( ) is the chemistry of all of the elements and their compounds, with the exception of compounds of carbon with hydrogen and of their derivatives.
【简答题】These four compounds are all belong to ( ).
【单选题】According to Snyder et al, all of the following compounds can bind to specific receptors in the brain EXCEPT______
A.
IBMX
B.
caffeine
C.
adenosine
D.
theophylline
E.
phosphodiesterase
【单选题】All of the following compounds are components of the respiratory chain, EXCEPT:
A.
CoQ
B.
Cytb
C.
CoA
D.
NAD+
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