1,1'-(1,3-Propanediyl)dipyrene 1,3-Bis(1-pyrene)propane 1,3-Di-(1-pyrenyl)propane 1,3-Dipp 1,3-Dipyrenylpropane 61549-24-4 DPYP Py(CH2)3Py Pyrene, 1,1'-(1,3-propanediyl)bis-