연관
purine pyrimidine
purine pyrimidine base
pyrimidine synthesis
pyrazine
pyridazine
purine base
pyperidine
adenine guanine cytosine thymine
purines
pyridine pkb
pyrimidine purine
연관
purine pyrimidine
purine pyrimidine base
pyrimidine synthesis
pyrazine
pyridazine
purine base
pyperidine
adenine guanine cytosine thymine
purines
pyridine pkb
pyrimidine purine