2 - ((1'-n-hexyloxy) ethyl) -2-vinyl - Form and preparation method pheophorbide acid pyrophosphate -a and

The present invention provides a HPPH (2 - ((1'- n-hexyloxy) ethyl) -2-vinyl - pheophorbide acid pyrophosphate -a) crystalline form, which can X- powder diffraction ( XRD) spectra, and differential scanning calorimetry (DSC) spectrum characterized. Meanwhile, the present invention also provides a process for preparing crystalline form HPPH sample.