Table 2. The various arms extending from the central ring.

Arm designation	Carbon atoms shared with central ring	IUPAC name
1 (Fig. 3 ▸ b)	C5, C6	1-indanone
2 (Fig. 3 ▸ c)	C2, C3	1-indanone
3 (Fig. 3 ▸ d)	C1	1,3-indandione
4 (Fig. 3 ▸ e)	C4	1-(1H-indazol-1-yl)ethanone
5 (Fig. 3 ▸ f)	C7, C8	1-H-inden-1-one