2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide-a 2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide-a 2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide-a (hpph) is a photosensitiser chemical that is used in photodynamic therapy. 2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide-a names other names photochlor identifiers cas number 149402-51-7 y 3d model (jsmol) interactive image abbreviations hpph chemspider 4589621 y pubchem cid 5488034 unii dob7y3rsx0 y inchi inchi=1s/c39h48n4o4/c1-8-10-11-12-15-47-24(7)36-22(5)30-17-29-21(4)26(13-14-35(45)46)38(42-29)27-16-34(44)37-23(6)31(43-39(27)37)18-32-25(9-2)20(3)28(40-32)19-33(36)41-30/h17-19,21,24,26,40-41h,8-16h2,1-7h3,(h,45,46)/b28-19-,29-17-,30-17-,31-18-,32-18-,33-19-,38-27-/t21-,24?,26-/m0/s1 ykey: odjvlhdvegaiaw-nmwxtppcsa-n yinchi=1/c39h48n4o4/c1-8-10-11-12-15-47-24(7)36-22(5)30-17-29-21(4)26(13-14-35(45)46)38(42-29)27-16-34(44)37-23(6)31(43-39(27)37)18-32-25(9-2)20(3)28(40-32)19-33(36)41-30/h17-19,21,24,26,40-41h,8-16h2,1-7h3,(h,45,46)/b28-19-,29-17-,30-17-,31-18-,32-18-,33-19-,38-27-/t21-,24?,26-/m0/s1key: odjvlhdvegaiaw-nmwxtppcbi smiles ccccccoc(c)c1=c2c=c3c(=c(c(=cc4=nc5=c(cc(=o)c5=c4c)c6=nc(=cc(=c1c)n2)(6ccc(=o)o)c)n3)cc)c properties chemical formula c39h48n4o4 molar mass 636.837 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references it is being developed under the brand name photochlor. clinical trials a phase i/ii clinical trial started in 1997 for esophageal cancer. a phase ii trial for non-small cell lung cancer is due to run from 2007 to 2011.