Organic Prefixes
#C's	prefix
1	meth
2	eth
3	prop
4	but
5	pent
6	hex
7	hept
8	oct
9	non
10	dec
11	undec
12	dodec
13	tridec
14	tetradec
15	pentadec
20	icos
21	henicos
22	docos
30	triacont
40	tetracont