卟 卟 bu3
卟
bǔ
see 卟啉, porphyrin; see 卟吩, porphin

strokes 5
radical
卜
strokes after radical 3
卟吩 卟吩 bu3 fen1
卟吩
bǔfēn
porphin C20H14N4

卟啉 卟啉 bu3 lin2
卟啉
bǔlín
porphyrin (organic chemical essential to hemoglobin and chlorophyll)