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Protoplanetary disk around a just born young star contains a lot of cosmicdust. especially polycyclic-aromatic-hydrocarbon (PAH), which would becomebasic component to create biological organics. This study classified manyastronomically observed infrared spectra of protoplanetary disks to threetypical spectra. Type-A show well known astronomical bands of 6.2, 7.8, 8.6 and11.3 micrometer. Whereas Type-B included unknown complex bands. Type-(A+B) wastheir mixed type. We tried to find specific molecule by Density FunctionalTheory (DFT) calculation. We found that Type-A could be explained by large PAHmolecules of (C$_{23}$H$_{12}$) and (C$_{53}$H$_{18}$), which arehexagon-pentagon combined molecular structure. Background molecule of Type-Bwas smaller ones of (c-C$_3$H$_2$), (C$_5$H$_5$), (C$_9$H$_7$) and(C$_{12}$H$_8$). Type-(A+B) was reproduced well by mixing those molecules of Aand B. Astronomical detailed observation shows that central star of Type-A haslarger mass and higher temperature than that of Type-B. This suggests that atvery early stage of our solar system, our protoplanetary disk had been made upby Type-B molecules. It was interesting that (C$_5$H$_5$) and (C$_9$H$_7$) ofType-B molecules has similar molecular structure with biological nucleic-acidon our earth. Type-B molecules was supposed to become the template forsynthesizing biological organics and finally for creating our life.

Classifying Protoplanetary disks Infrared Spectrum and Analysis by  c-C$_3$H$_2$ C$_5$H$_5$ C$_9$H$_7$ C$_{12}$H$_8$ C$_{23}$H$_{12}$ and  C$_{53}$H$_{18}$ to be Capable Template for Biological Molecule