Apply the Skill 04.13 Vitamin D helps the body absorb calcium, iron, magnesium, phosphate, and zinc. Several compounds with the general structure below were synthesized and tested for their ability to mimic vitamin D activity. Naming this general structure requires nomenclature rules that were not covered in this chapter, although you should be able to assign a name to the hydrocarbon core (highlighted) ?? Provide a systematic name for this hydrocarbon core O 1-(5-ethylheptyl)-4-methylbicyclo[2.2.2]octane O 4-(5-ethylheptyl)-1-methylbicyclo[2.2.2]octane O 1-(5-heptylethyl)-4-methylbicyclo[2.2.2]octane 4S heptyethy)-1-methylbicyclot2.2.2joctane O 4-(5-heptyethyl)-1-methylbicyclo[2.2.2joctane Solution 1-(5-ethylheptyl)-4-methylbicyclo[2,2,2]octane explanation bicyclo compound is 222 fused ring obviously. ethyl group is attaached to the 5 th carbon of heptane long chain count starting from bicyclo ring side. the other side of bicyclo ring has methyl grooup given 4, 1 carbon of bicyclo ring is given connection to long chain hydrocarbon( so its one carbon preferred). ---------------------------------------------------------------------------------------------------------------------------------------- 1 and 4 positions intechanged also lighted porton finds nodifference in orientation .