Thank you very much Dr. Saikat Sen. 

Could you please give me specific name related to "Taxagifine" extracted from any species of Taxus.

Here's a place where you can get IUPAC names from structures. Being software, it may have bugs so verify your results: https://web.chemdoodle.com/demos/iupac-naming/

Thank you Jack Silver. I know this page but I dont know how to use it. I cant post the structure there. I need to know the IUPAC name of this compound ASAP.

You can draw the structure, the name is generated as you draw above the drawing screen. Some sites let you upload the structure as a SMILES file (string of text). The resource above lets you paste the contents of a MOL file, which is a fairly common format. You may need to save your structure in that format first.

This link lists other resources to do what you want: http://canterbury.libguides.com/chem/structure-drawing

Thanks a lot, Dr. Saikat. I wish this answer would help me. Thanks again for your prompt informative answer.