# Species Formula 4029 Ti(IV)As2S2Cl2 (CIRHUG) (Geo)C18H34S2Cl2TiAs2 4030 Arsenic, trimerAs3 4031 As(III)S2C (MARSTA) (Geo)C5H9S3As3 4032 As(III)S2C (MARSTA)C5H9S3As3 4033 Arsenic, tetramerAs4 4034 As(III)O2C (ASOXAD) (Geo)C2H4O4As4 4035 As(III)O2C (ASOXAD)C2H4O4As4 4036 Arsenic trioxide dimerO6As4 4037 As4O6O6As4 4038 As4O6 (Geo)O6As4 4039 As(III)As2C (ASMETH) (Geo) C5H15As5 4040 As(III)As2C (ASMETH)C5H15As5 4041 Selenium, cationSe 4042 Selenium, atomSe 4043 Selenyl radicalHSe 4044 Hydrogen selenide (Geo)H2Se 4045 Hydrogen selenideH2Se 4046 Selenium carbide (Geo)CSe 4047 Methylselenium hydride (Geo)CH4Se 4048 DimethylseleniumC2H6Se 4049 Ethyl selanol (anti) (Geo)C2H6Se