The size and steric hindrance of substituent of porphyrin is one of the crucial factors to affect the interaction between porphyrins and DNA.
吡啶取代基的大小和空间位阻是影响相互作用方式的关键因素之一。
The steric and staticelectro interaction is the main factors leading to the enantioselectivity.
然而，空间作用是导致沟选择性的主要因素。
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