The Effect of Sulphur Atom on the Structure of Biomolecule 2-Thiocytosine in the Gas-Phase, Solid-State, and Hydrated Forms and in DNA-DNA Microhelices as Compared to Canonical Ones

硫原子对气相、固态、水合状态以及DNA-DNA微螺旋中2-硫胞嘧啶生物分子结构的影响（与典型结构相比）